Model vs model
GLM 5.3 vs GLM 5.3 Flash
GLM 5.3 and GLM 5.3 Flash are both in llmwise. What each gets on every plan, what it reads, how it's served and what happens when its provider fails, from the catalog and the code that runs them.
Model prices and specs checked against OpenRouter's GLM 5.3 page, OpenRouter's GLM 5.3 Flash page. Updated .
Short answer
GLM 5.3 Flash is an everyday model (60 messages a day on Pro); GLM 5.3 draws on the monthly allowance (up to 250 messages a month on Pro). Otherwise, only GLM 5.3 Flash reads images. In our test runs, GLM 5.3 passed 48 of the 50 prompts both answered and GLM 5.3 Flash 40; 8 prompts split them, most on customer support (5 to 2).
GLM 5.3 vs GLM 5.3 Flash, prompt by prompt
Every prompt GLM 5.3 and GLM 5.3 Flash both answered, compared directly, their biggest differences first. One run each, through OpenRouter: a wait depends on the provider and the load that day, so a lead under 10% counts as close.
Of the 50 prompts both answered, both passed 40, only GLM 5.3 passed 8, only GLM 5.3 Flash passed 0, and neither passed 2. GLM 5.3 answered sooner on 43 of the 50 and GLM 5.3 Flash on 4; the rest were within 10% of each other. The 50 replies cost $0.0364 on GLM 5.3 and $0.0096 on GLM 5.3 Flash: 3.8× less on GLM 5.3 Flash.
The 8 prompts only one of GLM 5.3 and GLM 5.3 Flash passed
Rewrite corporate jargon in plain words (writing): GLM 5.3 passed and GLM 5.3 Flash didn't. GLM 5.3: Graded 4.0 of 5 on average (lowest 3). GLM 5.3 Flash: Graded 3.3 of 5 on average (lowest 3).
A product announcement with five rules (writing): GLM 5.3 passed and GLM 5.3 Flash didn't. GLM 5.3: Graded 4.3 of 5 on average (lowest 4). GLM 5.3 Flash: Graded 3.3 of 5 on average (lowest 3).
An email thread in one sentence (summarization): GLM 5.3 passed and GLM 5.3 Flash didn't. GLM 5.3: Graded 4.3 of 5 on average (lowest 3). GLM 5.3 Flash: Graded 3.7 of 5 on average (lowest 3).
Correlation between ad spend and sign-ups (data analysis): GLM 5.3 passed and GLM 5.3 Flash didn't. GLM 5.3: Final answer 0.97: right. GLM 5.3 Flash: Final answer 0.99; expected 0.97.
A late order (customer support): GLM 5.3 passed and GLM 5.3 Flash didn't. GLM 5.3: Graded 5.0 of 5 on average (lowest 5). GLM 5.3 Flash: Graded 3.7 of 5 on average (lowest 3).
A frustrated customer (customer support): GLM 5.3 passed and GLM 5.3 Flash didn't. GLM 5.3: Graded 4.7 of 5 on average (lowest 4). GLM 5.3 Flash: Graded 4.0 of 5 on average (lowest 3); but 158 words, over the 150 allowed.
A refund request outside the window (customer support): GLM 5.3 passed and GLM 5.3 Flash didn't. GLM 5.3: Graded 4.7 of 5 on average (lowest 4). GLM 5.3 Flash: Graded 4.0 of 5 on average (lowest 2).
Book a meeting from a sentence (agents and tool use): GLM 5.3 passed and GLM 5.3 Flash didn't. GLM 5.3: Made the 1 expected call. GLM 5.3 Flash: Expected create_event(attendees: ["priya@northwind.test"], duration_minutes: 30, start: "2026-10-08T15:00", title: {"contains":"Q4"}); got find_contact(name: "Priya Shah"); create_event(title: "Q4 plan review", start: "2026-10-08T15:00", duration_minutes: 30, attendees: ["priya@northwind.test"]).
Job by job, the widest gaps first
Customer support: GLM 5.3 passed 5 of 5 and GLM 5.3 Flash 2 of 5. GLM 5.3 answered 2.7× sooner at the median, 2.3 s against 6.2 s. GLM 5.3 Flash cost 2.4× less, $0.0023 against $0.0010 for the 5 replies. GLM 5.3 Flash's replies ran 25% longer, in tokens of reply, thinking not counted.
Writing: GLM 5.3 passed 4 of 5 and GLM 5.3 Flash 2 of 5. GLM 5.3 answered 4.8× sooner at the median, 1.8 s against 8.5 s. GLM 5.3 Flash cost 1.8× less, $0.0029 against $0.0016 for the 5 replies. Their replies ran to about the same length.
Data analysis: GLM 5.3 passed 5 of 5 and GLM 5.3 Flash 4 of 5. GLM 5.3 answered 5.1× sooner at the median, 1.9 s against 9.8 s. GLM 5.3 Flash cost 5.0× less, $0.0096 against $0.0019 for the 5 replies. GLM 5.3 Flash's replies ran 92% longer, in tokens of reply, thinking not counted.
Summarization: GLM 5.3 passed 4 of 5 and GLM 5.3 Flash 3 of 5. GLM 5.3 answered 3.6× sooner at the median, 1.1 s against 4.0 s. GLM 5.3 Flash cost 4.8× less, $0.0027 against $0.0006 for the 5 replies. Their replies ran to about the same length.
Agents and tool use: GLM 5.3 passed 5 of 5 and GLM 5.3 Flash 4 of 5. GLM 5.3 answered 3.6× sooner at the median, 0.9 s against 3.2 s. GLM 5.3 Flash cost 3.4× less, $0.0022 against $0.0006 for the 5 replies. GLM 5.3 Flash's replies ran 12% longer, in tokens of reply, thinking not counted.
Translation: GLM 5.3 passed 5 of 5 and GLM 5.3 Flash 5 of 5. GLM 5.3 answered 2.6× sooner at the median, 1.6 s against 4.1 s. GLM 5.3 Flash cost 7.1× less, $0.0035 against $0.0005 for the 5 replies. GLM 5.3's replies ran 42% longer, in tokens of reply, thinking not counted.
Coding: GLM 5.3 passed 5 of 5 and GLM 5.3 Flash 5 of 5. GLM 5.3 answered 7.9× sooner at the median, 1.1 s against 8.4 s. GLM 5.3 Flash cost 5.8× less, $0.0073 against $0.0013 for the 5 replies. Their replies ran to about the same length.
RAG and answering from documents: GLM 5.3 passed 5 of 5 and GLM 5.3 Flash 5 of 5. GLM 5.3 answered 3.5× sooner at the median, 0.6 s against 2.2 s. GLM 5.3 Flash cost 3.3× less, $0.0025 against $0.0008 for the 5 replies. GLM 5.3 Flash's replies ran 74% longer, in tokens of reply, thinking not counted.
SQL: GLM 5.3 passed 5 of 5 and GLM 5.3 Flash 5 of 5. GLM 5.3 answered 1.2× sooner at the median, 1.2 s against 1.4 s. GLM 5.3 Flash cost 2.4× less, $0.0016 against $0.0006 for the 5 replies. Their replies ran to about the same length.
Math: GLM 5.3 passed 5 of 5 and GLM 5.3 Flash 5 of 5. GLM 5.3 answered 2.9× sooner at the median, 0.9 s against 2.7 s. GLM 5.3 Flash cost 2.4× less, $0.0018 against $0.0008 for the 5 replies. GLM 5.3 Flash's replies ran 23% longer, in tokens of reply, thinking not counted.
All 50 prompts: who passed, who answered sooner, who cost less
| Prompt | Result | Sooner | Cheaper |
|---|---|---|---|
| Turn a title into a URL slug | Both passed | GLM 5.3, 6.0×took 0.4 s and 2.6 s | GLM 5.3 Flash, 15.2×cost $0.0010 and $0.0001 |
| Parse a duration like “1h 30m” | Both passed | GLM 5.3, 7.8×took 1.1 s and 8.2 s | GLM 5.3 Flash, 4.1×cost $0.0014 and $0.0003 |
| Merge overlapping intervals | Both passed | GLM 5.3, 11.5×took 0.8 s and 9.6 s | GLM 5.3 Flash, 3.4×cost $0.0008 and $0.0002 |
| Evaluate an arithmetic expression, no eval | Both passed | GLM 5.3 Flash, 1.1×took 12.5 s and 11.1 s | GLM 5.3 Flash, 4.8×cost $0.0017 and $0.0004 |
| Parse CSV with quoted fields | Both passed | GLM 5.3, 3.2×took 2.6 s and 8.4 s | GLM 5.3 Flash, 9.2×cost $0.0024 and $0.0003 |
| Announce a second bakery shop on LinkedIn | Both passed | GLM 5.3, 13.9×took 2.9 s and 39.6 s | GLM 5.3, 2.8×cost $0.0004 and $0.0011 |
| Rewrite corporate jargon in plain words | Only GLM 5.3 | GLM 5.3, 2.8×took 1.8 s and 4.9 s | GLM 5.3 Flash, 2.1×cost $0.0002 and $0.0001 |
| Decline a meeting and offer two times | Both passed | GLM 5.3, 3.7×took 1.4 s and 5.3 s | GLM 5.3 Flash, 1.7×cost $0.0003 and $0.0002 |
| A product announcement with five rules | Only GLM 5.3 | GLM 5.3, 10.0×took 0.8 s and 8.5 s | GLM 5.3 Flash, 5.3×cost $0.0008 and $0.0001 |
| Argue both sides of free buses | Neither passed | GLM 5.3, 6.3×took 1.8 s and 11.2 s | GLM 5.3 Flash, 8.5×cost $0.0013 and $0.0001 |
| A discount, then sales tax | Both passed | GLM 5.3, 2.5×took 0.9 s and 2.4 s | GLM 5.3 Flash, 2.3×cost $0.0002 and $0.0001 |
| Pens at 3 for $4 | Both passed | GLM 5.3, 9.8×took 1.5 s and 14.6 s | GLM 5.3, 1.5×cost $0.0002 and $0.0003 |
| Compound interest over three years | Both passed | GLM 5.3, 8.5×took 0.6 s and 4.9 s | GLM 5.3 Flash, 3.4×cost $0.0005 and $0.0002 |
| Four-digit numbers whose digits sum to 9 | Both passed | GLM 5.3, 1.5×took 1.9 s and 2.7 s | GLM 5.3 Flash, 2.1×cost $0.0003 and $0.0001 |
| The highest of three dice is a 5 | Both passed | Closetook 0.9 s and 0.9 s | GLM 5.3 Flash, 5.3×cost $0.0006 and $0.0001 |
| An article in three bullets | Neither passed | GLM 5.3, 1.4×took 2.8 s and 4.0 s | GLM 5.3 Flash, 4.5×cost $0.0004 and $0.0001 |
| An email thread in one sentence | Only GLM 5.3 | GLM 5.3, 3.9×took 1.0 s and 4.0 s | GLM 5.3 Flash, 1.6×cost $0.0002 and $0.0001 |
| Decisions and action items from a meeting | Both passed | GLM 5.3, 1.3×took 1.5 s and 1.9 s | GLM 5.3 Flash, 2.7×cost $0.0002 and $0.0001 |
| A quarterly memo for the CEO | Both passed | GLM 5.3, 7.5×took 1.1 s and 8.3 s | GLM 5.3 Flash, 6.7×cost $0.0010 and $0.0001 |
| A study with a negative result | Both passed | GLM 5.3, 4.5×took 0.8 s and 3.7 s | GLM 5.3 Flash, 9.0×cost $0.0008 and $0.0001 |
| The region with the most revenue | Both passed | GLM 5.3, 4.2×took 2.1 s and 8.8 s | GLM 5.3, 1.3×cost $0.0004 and $0.0005 |
| Average order value in August | Both passed | GLM 5.3, 7.5×took 1.9 s and 14.5 s | Closecost $0.0004 and $0.0004 |
| Revenue change from July to August | Both passed | GLM 5.3, 7.1×took 1.4 s and 9.8 s | GLM 5.3 Flash, 4.2×cost $0.0016 and $0.0004 |
| A median, filtered two ways | Both passed | GLM 5.3, 3.9×took 1.0 s and 3.7 s | GLM 5.3 Flash, 8.9×cost $0.0011 and $0.0001 |
| Correlation between ad spend and sign-ups | Only GLM 5.3 | GLM 5.3, 3.5×took 5.6 s and 19.4 s | GLM 5.3 Flash, 11.4×cost $0.0062 and $0.0005 |
| A late order | Only GLM 5.3 | GLM 5.3, 2.4×took 2.6 s and 6.2 s | GLM 5.3 Flash, 1.5×cost $0.0004 and $0.0003 |
| A return inside the window | Both passed | GLM 5.3, 4.0×took 1.6 s and 6.2 s | Closecost $0.0002 and $0.0002 |
| A frustrated customer | Only GLM 5.3 | GLM 5.3, 2.9×took 2.3 s and 6.8 s | GLM 5.3 Flash, 2.0×cost $0.0003 and $0.0002 |
| A refund request outside the window | Only GLM 5.3 | GLM 5.3, 2.1×took 1.1 s and 2.4 s | GLM 5.3 Flash, 5.7×cost $0.0009 and $0.0002 |
| A message with a planted instruction | Both passed | Closetook 5.3 s and 5.2 s | GLM 5.3 Flash, 2.7×cost $0.0005 and $0.0002 |
| A delivery message into Spanish | Both passed | GLM 5.3, 2.6×took 1.5 s and 3.9 s | GLM 5.3 Flash, 2.4×cost $0.0002 and $0.0001 |
| A product description into French | Both passed | GLM 5.3, 2.8×took 1.5 s and 4.1 s | GLM 5.3 Flash, 3.3×cost $0.0003 and $0.0001 |
| A meeting note into German | Both passed | GLM 5.3, 2.7×took 1.6 s and 4.2 s | GLM 5.3 Flash, 2.4×cost $0.0002 and $0.0001 |
| Idioms into natural Japanese | Both passed | GLM 5.3, 2.8×took 1.7 s and 4.8 s | GLM 5.3 Flash, 13.4×cost $0.0012 and $0.0001 |
| A lease clause into Brazilian Portuguese | Both passed | GLM 5.3 Flash, 1.3×took 1.7 s and 1.3 s | GLM 5.3 Flash, 11.2×cost $0.0016 and $0.0001 |
| Customers in one country | Both passed | GLM 5.3, 1.5×took 0.8 s and 1.2 s | Closecost $0.0001 and $0.0001 |
| Count orders by status | Both passed | GLM 5.3, 1.8×took 1.2 s and 2.1 s | Closecost $0.0001 and $0.0001 |
| Revenue by category | Both passed | GLM 5.3, 2.1×took 1.2 s and 2.6 s | GLM 5.3 Flash, 1.8×cost $0.0002 and $0.0001 |
| Every customer, even those without orders | Both passed | Closetook 1.0 s and 1.0 s | GLM 5.3 Flash, 6.2×cost $0.0007 and $0.0001 |
| Monthly revenue with a running total | Both passed | GLM 5.3 Flash, 2.2×took 3.2 s and 1.4 s | GLM 5.3 Flash, 2.5×cost $0.0004 and $0.0002 |
| A fact from one section | Both passed | GLM 5.3 Flash, 1.2×took 0.9 s and 0.7 s | GLM 5.3 Flash, 1.3×cost $0.0003 and $0.0002 |
| Core hours and start times | Both passed | GLM 5.3, 7.8×took 0.5 s and 3.9 s | GLM 5.3 Flash, 3.2×cost $0.0007 and $0.0002 |
| Two sections in one answer | Both passed | GLM 5.3, 3.7×took 0.5 s and 1.9 s | GLM 5.3 Flash, 4.5×cost $0.0005 and $0.0001 |
| A later amendment changes the answer | Both passed | GLM 5.3, 1.8×took 1.3 s and 2.2 s | GLM 5.3 Flash, 4.2×cost $0.0006 and $0.0001 |
| A question the handbook doesn't answer | Both passed | GLM 5.3, 4.6×took 0.6 s and 2.9 s | GLM 5.3 Flash, 4.7×cost $0.0005 and $0.0001 |
| Pick the tool and work out the date | Both passed | GLM 5.3, 3.6×took 0.9 s and 3.2 s | GLM 5.3 Flash, 3.8×cost $0.0002 and $0.0001 |
| Convert a currency | Both passed | GLM 5.3, 2.6×took 1.1 s and 3.0 s | Closecost $0.0001 and $0.0001 |
| Book a meeting from a sentence | Only GLM 5.3 | GLM 5.3, 4.0×took 1.7 s and 6.8 s | GLM 5.3 Flash, 3.4×cost $0.0006 and $0.0002 |
| Search, but don't book | Both passed | GLM 5.3, 4.2×took 0.5 s and 2.3 s | GLM 5.3 Flash, 6.8×cost $0.0005 and $0.0001 |
| Two calls with a unit conversion | Both passed | GLM 5.3, 4.9×took 0.7 s and 3.4 s | GLM 5.3 Flash, 3.8×cost $0.0008 and $0.0002 |
GLM 5.3 vs GLM 5.3 Flash in our test runs
GLM 5.3 and GLM 5.3 Flash on the same prompts, job by job: how many replies passed their check.
Based on 100 of our test runs on , through OpenRouter with the app's own prompt and settings. Updated .
| Job | GLM 5.3 | GLM 5.3 Flash |
|---|---|---|
| Coding | 5 of 5 | 5 of 5 |
| Writing | 4 of 5 | 2 of 5 |
| Math | 5 of 5 | 5 of 5 |
| Summarization | 4 of 5 | 3 of 5 |
| Data analysis | 5 of 5 | 4 of 5 |
| Customer support | 5 of 5 | 2 of 5 |
| Translation | 5 of 5 | 5 of 5 |
| SQL | 5 of 5 | 5 of 5 |
| RAG and answering from documents | 5 of 5 | 5 of 5 |
| Agents and tool use | 5 of 5 | 4 of 5 |
| All jobs | 48 of 50 · 1 message each · $0.0007 a reply | 40 of 50 · 1 message each · $0.0002 a reply |
The same prompts, sent to both through llmwise's own pipeline and checked the same way: five for each job. A bold count is the one that passed more. Messages: what each reply counted as on Pro. Cost: what OpenRouter charged us per reply, on average. Every prompt, and how it's scored.
Where they differed most, customer support: both replies to a prompt only one of them passed.
An everyday prompt: “A late order”, in full.
GLM 5.3
Passed: Graded 5.0 of 5 on average (lowest 5).
Hi, I'm sorry your rain jacket still hasn't arrived — that's well past our standard 3–5 business day delivery window, and I understand how frustrating that is. I'd like to look into where your package is right away. Could you reply with your order number so I can check its status and tracking? If it's lost or stuck in transit, we'll sort out a replacement or solution for you. Also, because your order is more than 7 business days late, you're entitled to free express shipping on your next order — I'll make sure that's applied to your account. Thanks for your patience, and again, apologies for the delay. Sam, Northwind support
529 tokens in, 163 out (21 of them reasoning) · 2.6 s · $0.0004 · 1 message on Pro · answered by z-ai/glm-5.3 via Baidu ·
GLM 5.3 Flash
Failed: Graded 3.7 of 5 on average (lowest 3).
Dear customer, Thank you for reaching out, and I'm sorry your rain jacket hasn't arrived yet. That's certainly not the experience we want for you. Standard delivery normally takes 3–5 business days, and since your order is now 9 business days overdue, it has clearly been delayed. I apologize for the inconvenience. Because your order is more than 7 business days late, I'd be happy to add free express shipping to your next order as a gesture of apology. Just reply to this message or mention it when you place your next order, and we'll apply it. Please also keep an eye out for the package — if it hasn't arrived within the next few business days, contact us and we'll investigate with the carrier or arrange a replacement or refund. Thank you for your patience. Sam, Northwind support
530 tokens in, 259 out (90 of them reasoning) · 6.2 s · $0.0003 · 1 message on Pro · answered by z-ai/glm-5.3-flash via Wafer ·
GLM 5.3 and GLM 5.3 Flash on every plan
Whether the one-time free trial reaches each model, then each paid plan's messages on it.
| Plan | Price | GLM 5.3 | GLM 5.3 Flash |
|---|---|---|---|
| Free | $0 | In the one-time trial of 5 messages | In the one-time trial of 5 messages |
| Pro | $20 a month | Up to 250 a month | 60 a day |
| Max | $50 a month | Up to 800 a month | 120 a day |
| Ultra | $100 a month | Up to 1,800 a month | 200 a day |
| Studio | $200 a month | Up to 4,000 a month | 200 a day |
Prices don't include tax, which is added where it applies and shown before you pay. A paid plan's month is one allowance shared by every model, so each monthly count is the most you get if all of it goes to that model. It renews each billing period; everyday models refill daily at 00:00 UTC. Long chats count more per reply. How pricing works.
Every limit is published. Paid plans also have a monthly fair-use limit on AI cost: Pro $7.50, Max $20, Ultra $42, Studio $85. Using every message on your plan at typical sizes stays under it; very large messages and heavy research use it faster. Every limit, explained.
What differs
Messages on Pro
GLM 5.3 Flash is an everyday model (60 messages a day on Pro); GLM 5.3 draws on the monthly allowance (up to 250 messages a month on Pro).
Context window
Both take up to 1.05M tokens of context. A chat in llmwise holds up to 200k tokens, which fits in either, so the difference shows only through each maker's own API.
Images and PDFs
GLM 5.3 doesn't read images. GLM 5.3 and GLM 5.3 Flash get a PDF's text rather than the file itself.
On Free
Both are in the free trial.
Where messages go
Both are GLM models, served the same way. Served through OpenRouter, only by hosts that don't store or train on prompts. The maker's own endpoint is never asked.
Fact by fact
| Fact | GLM 5.3 | GLM 5.3 Flash |
|---|---|---|
| Context window | 1.05M tokens | 1.05M tokens |
| Reads images | No | Yes |
| PDFs | Text only | Text only |
| Reasoning | Yes | Yes |
| API price (September 2026) | $1.40 in / $4.40 out per million tokens | $0.15 in / $0.50 out per million tokens |
| A typical message at API prices (4,000 tokens in, 700 out) | $0.0087 | $0.0010 |
| A $10 top-up adds | 200 messages | Nothing: an everyday model's count is daily |
| Where a message goes | Served through OpenRouter, only by hosts that don't store or train on prompts. The maker's own endpoint is never asked. | Served through OpenRouter, only by hosts that don't store or train on prompts. The maker's own endpoint is never asked. |
| If the provider fails | When one host is down, OpenRouter moves the request to another host that meets the same rules. | When one host is down, OpenRouter moves the request to another host that meets the same rules. |
| Anthropic's safety fallback | Doesn't apply | Doesn't apply |
GLM 5.3 or GLM 5.3 Flash?
From the facts above and our test runs: the rest is how their answers suit your work, which one chat can show you.
Pick GLM 5.3 Flash: its messages come from the daily count (60 messages a day on Pro), so they leave the monthly allowance for bigger models; it reads images.
Each model's page, the families, and other pairs
GLM 5.3 vs GLM 5.3 Flash is one pair of models. The page below covers the whole family.
- GLM 5.3: price, limits and messages on every plan
- GLM 5.3 Flash: price, limits and messages on every plan
- GLM 5.3 and GLM 5.3 Flash, in one chat
- Kimi K3 vs GLM 5.3
- DeepSeek V4 Pro vs GLM 5.3
- Claude Sonnet 5 vs GLM 5.3
- Claude Haiku 4.5 vs GLM 5.3 Flash
- GPT-6 Luna vs GLM 5.3 Flash
- Gemini 3.8 Flash vs GLM 5.3 Flash
- Every model-vs-model page
Both are made by the same company, so they're served the same way.
Questions
Is GLM 5.3 or GLM 5.3 Flash cheaper in llmwise?
GLM 5.3 Flash is an everyday model (60 messages a day on Pro); GLM 5.3 draws on the monthly allowance (up to 250 messages a month on Pro). Every paid plan's monthly allowance is shared by all models, so each count is the most you get if it all goes to that model.
Can I try GLM 5.3 and GLM 5.3 Flash for free?
Yes: both are in the free trial of 5 messages.
Which has the bigger context window, GLM 5.3 or GLM 5.3 Flash?
Neither: both take 1.05M tokens. A chat in llmwise holds up to 200k tokens, which fits in either, so the difference shows only through each maker's own API.
Can I use GLM 5.3 and GLM 5.3 Flash in the same chat?
Yes. Pick GLM 5.3 for one message and GLM 5.3 Flash for the next; the second sees the whole chat, including the first one's answer.
Which did better in your test runs, GLM 5.3 or GLM 5.3 Flash?
On the same 50 prompts, run on September 27, 2026, GLM 5.3 passed 48 and GLM 5.3 Flash passed 40. The table on this page has each job, and every reply is published.
Claude, GPT, Gemini, DeepSeek, Grok, Kimi, and GLM, in one chat.
See what a message costs before you send it. Free is 5 messages to try; sign in with an email link, no password or card.