Model vs model
Claude Sonnet 5.5 vs Claude Haiku 5.5
Claude Sonnet 5.5 and Claude Haiku 5.5 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 Claude Sonnet 5.5 page, OpenRouter's Claude Haiku 5.5 page. Updated .
Short answer
Claude Haiku 5.5 is an everyday model (60 messages a day on Pro); Claude Sonnet 5.5 draws on the monthly allowance (up to 125 messages a month on Pro). Otherwise, only Claude Sonnet 5.5 can be passed to another model by its maker's safety system. In our test runs, Claude Sonnet 5.5 passed 47 of the 50 prompts both answered and Claude Haiku 5.5 45; 2 prompts split them, most on writing (4 to 3).
Claude Sonnet 5.5 vs Claude Haiku 5.5, prompt by prompt
Every prompt Claude Sonnet 5.5 and Claude Haiku 5.5 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 45, only Claude Sonnet 5.5 passed 2, only Claude Haiku 5.5 passed 0, and neither passed 3. Claude Sonnet 5.5 answered sooner on 11 of the 50 and Claude Haiku 5.5 on 31; the rest were within 10% of each other. The 50 replies cost $0.1912 on Claude Sonnet 5.5 and $0.0118 on Claude Haiku 5.5: 16.3× less on Claude Haiku 5.5.
The 2 prompts only one of Claude Sonnet 5.5 and Claude Haiku 5.5 passed
Rewrite corporate jargon in plain words (writing): Claude Sonnet 5.5 passed and Claude Haiku 5.5 didn't. Claude Sonnet 5.5: Graded 4.7 of 5 on average (lowest 4). Claude Haiku 5.5: Graded 3.3 of 5 on average (lowest 2).
An article in three bullets (summarization): Claude Sonnet 5.5 passed and Claude Haiku 5.5 didn't. Claude Sonnet 5.5: Graded 4.7 of 5 on average (lowest 4). Claude Haiku 5.5: Graded 3.7 of 5 on average (lowest 3); but 61 words, over the 60 allowed.
Job by job, the widest gaps first
Writing: Claude Sonnet 5.5 passed 4 of 5 and Claude Haiku 5.5 3 of 5. Claude Haiku 5.5 answered 1.5× sooner at the median, 2.3 s against 1.5 s. Claude Haiku 5.5 cost 21.2× less, $0.0171 against $0.0008 for the 5 replies. Their replies ran to about the same length.
Summarization: Claude Sonnet 5.5 passed 4 of 5 and Claude Haiku 5.5 3 of 5. Claude Haiku 5.5 answered 1.4× sooner at the median, 1.9 s against 1.4 s. Claude Haiku 5.5 cost 10.5× less, $0.0168 against $0.0016 for the 5 replies. Claude Sonnet 5.5's replies ran 12% longer, in tokens of reply, thinking not counted.
Translation: Claude Sonnet 5.5 passed 5 of 5 and Claude Haiku 5.5 5 of 5. Claude Haiku 5.5 answered 1.6× sooner at the median, 2.3 s against 1.4 s. Claude Haiku 5.5 cost 23.5× less, $0.0211 against $0.0009 for the 5 replies. Claude Sonnet 5.5's replies ran 29% longer, in tokens of reply, thinking not counted.
Customer support: Claude Sonnet 5.5 passed 4 of 5 and Claude Haiku 5.5 4 of 5. Claude Haiku 5.5 answered 1.3× sooner at the median, 2.5 s against 1.9 s. Claude Haiku 5.5 cost 20.1× less, $0.0232 against $0.0012 for the 5 replies. Their replies ran to about the same length.
RAG and answering from documents: Claude Sonnet 5.5 passed 5 of 5 and Claude Haiku 5.5 5 of 5. Claude Haiku 5.5 answered 1.3× sooner at the median, 1.4 s against 1.1 s. Claude Haiku 5.5 cost 19.7× less, $0.0140 against $0.0007 for the 5 replies. Their replies ran to about the same length.
Agents and tool use: Claude Sonnet 5.5 passed 5 of 5 and Claude Haiku 5.5 5 of 5. Claude Haiku 5.5 answered 1.4× sooner at the median, 1.4 s against 1.0 s. Claude Haiku 5.5 cost 18.7× less, $0.0129 against $0.0007 for the 5 replies. Their replies ran to about the same length.
SQL: Claude Sonnet 5.5 passed 5 of 5 and Claude Haiku 5.5 5 of 5. Claude Haiku 5.5 answered 1.4× sooner at the median, 1.8 s against 1.3 s. Claude Haiku 5.5 cost 17.2× less, $0.0190 against $0.0011 for the 5 replies. Claude Sonnet 5.5's replies ran 30% longer, in tokens of reply, thinking not counted.
Math: Claude Sonnet 5.5 passed 5 of 5 and Claude Haiku 5.5 5 of 5. Their median waits were close, 1.7 s against 1.7 s. Claude Haiku 5.5 cost 16.8× less, $0.0123 against $0.0007 for the 5 replies. Claude Haiku 5.5's replies ran 24% longer, in tokens of reply, thinking not counted.
Coding: Claude Sonnet 5.5 passed 5 of 5 and Claude Haiku 5.5 5 of 5. Claude Sonnet 5.5 answered 2.0× sooner at the median, 2.0 s against 3.9 s. Claude Haiku 5.5 cost 13.8× less, $0.0313 against $0.0023 for the 5 replies. Claude Sonnet 5.5's replies ran 12% longer, in tokens of reply, thinking not counted.
Data analysis: Claude Sonnet 5.5 passed 5 of 5 and Claude Haiku 5.5 5 of 5. Claude Sonnet 5.5 answered 1.4× sooner at the median, 2.3 s against 3.3 s. Claude Haiku 5.5 cost 13.1× less, $0.0235 against $0.0018 for the 5 replies. Claude Sonnet 5.5's replies ran 48% 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 | Claude Haiku 5.5, 1.2×took 1.8 s and 1.5 s | Claude Haiku 5.5, 20.0×cost $0.0028 and $0.0001 |
| Parse a duration like “1h 30m” | Both passed | Claude Sonnet 5.5, 2.7×took 2.0 s and 5.4 s | Claude Haiku 5.5, 7.1×cost $0.0036 and $0.0005 |
| Merge overlapping intervals | Both passed | Closetook 1.4 s and 1.3 s | Claude Haiku 5.5, 19.7×cost $0.0033 and $0.0002 |
| Evaluate an arithmetic expression, no eval | Both passed | Claude Haiku 5.5, 1.2×took 4.8 s and 3.9 s | Claude Haiku 5.5, 16.1×cost $0.0102 and $0.0006 |
| Parse CSV with quoted fields | Both passed | Claude Sonnet 5.5, 1.5×took 5.3 s and 8.1 s | Claude Haiku 5.5, 14.0×cost $0.0114 and $0.0008 |
| Announce a second bakery shop on LinkedIn | Both passed | Closetook 3.3 s and 3.4 s | Claude Haiku 5.5, 21.8×cost $0.0035 and $0.0002 |
| Rewrite corporate jargon in plain words | Only Claude Sonnet 5.5 | Claude Haiku 5.5, 1.3×took 1.6 s and 1.3 s | Claude Haiku 5.5, 20.6×cost $0.0025 and $0.0001 |
| Decline a meeting and offer two times | Both passed | Claude Haiku 5.5, 1.8×took 2.3 s and 1.3 s | Claude Haiku 5.5, 22.1×cost $0.0030 and $0.0001 |
| A product announcement with five rules | Both passed | Claude Haiku 5.5, 1.5×took 2.3 s and 1.5 s | Claude Haiku 5.5, 23.3×cost $0.0030 and $0.0001 |
| Argue both sides of free buses | Neither passed | Claude Haiku 5.5, 1.3×took 4.4 s and 3.3 s | Claude Haiku 5.5, 19.6×cost $0.0051 and $0.0003 |
| A discount, then sales tax | Both passed | Claude Haiku 5.5, 1.3×took 1.6 s and 1.3 s | Claude Haiku 5.5, 20.5×cost $0.0017 and $0.0001 |
| Pens at 3 for $4 | Both passed | Claude Haiku 5.5, 1.3×took 2.2 s and 1.7 s | Claude Haiku 5.5, 22.4×cost $0.0036 and $0.0002 |
| Compound interest over three years | Both passed | Closetook 1.3 s and 1.3 s | Claude Haiku 5.5, 20.2×cost $0.0021 and $0.0001 |
| Four-digit numbers whose digits sum to 9 | Both passed | Closetook 1.8 s and 1.9 s | Claude Haiku 5.5, 12.9×cost $0.0026 and $0.0002 |
| The highest of three dice is a 5 | Both passed | Claude Sonnet 5.5, 1.3×took 1.7 s and 2.1 s | Claude Haiku 5.5, 12.4×cost $0.0022 and $0.0002 |
| An article in three bullets | Only Claude Sonnet 5.5 | Claude Sonnet 5.5, 3.7×took 1.9 s and 7.2 s | Claude Haiku 5.5, 3.7×cost $0.0031 and $0.0008 |
| An email thread in one sentence | Neither passed | Claude Haiku 5.5, 1.3×took 1.4 s and 1.1 s | Claude Haiku 5.5, 19.3×cost $0.0023 and $0.0001 |
| Decisions and action items from a meeting | Both passed | Claude Haiku 5.5, 1.6×took 2.2 s and 1.3 s | Claude Haiku 5.5, 23.7×cost $0.0043 and $0.0002 |
| A quarterly memo for the CEO | Both passed | Claude Sonnet 5.5, 2.3×took 1.8 s and 4.2 s | Claude Haiku 5.5, 11.2×cost $0.0037 and $0.0003 |
| A study with a negative result | Both passed | Claude Haiku 5.5, 1.8×took 2.4 s and 1.4 s | Claude Haiku 5.5, 23.5×cost $0.0034 and $0.0001 |
| The region with the most revenue | Both passed | Claude Sonnet 5.5, 1.4×took 2.4 s and 3.4 s | Claude Haiku 5.5, 18.9×cost $0.0051 and $0.0003 |
| Average order value in August | Both passed | Claude Haiku 5.5, 1.3×took 1.7 s and 1.3 s | Claude Haiku 5.5, 18.2×cost $0.0037 and $0.0002 |
| Revenue change from July to August | Both passed | Claude Sonnet 5.5, 1.4×took 2.3 s and 3.3 s | Claude Haiku 5.5, 12.3×cost $0.0048 and $0.0004 |
| A median, filtered two ways | Both passed | Claude Sonnet 5.5, 1.7×took 1.5 s and 2.6 s | Claude Haiku 5.5, 14.5×cost $0.0030 and $0.0002 |
| Correlation between ad spend and sign-ups | Both passed | Claude Sonnet 5.5, 1.3×took 4.2 s and 5.7 s | Claude Haiku 5.5, 9.6×cost $0.0070 and $0.0007 |
| A late order | Both passed | Claude Haiku 5.5, 1.4×took 2.5 s and 1.8 s | Claude Haiku 5.5, 20.2×cost $0.0038 and $0.0002 |
| A return inside the window | Both passed | Claude Haiku 5.5, 1.5×took 2.2 s and 1.4 s | Claude Haiku 5.5, 21.2×cost $0.0035 and $0.0002 |
| A frustrated customer | Neither passed | Claude Haiku 5.5, 1.3×took 2.7 s and 2.1 s | Claude Haiku 5.5, 20.0×cost $0.0042 and $0.0002 |
| A refund request outside the window | Both passed | Closetook 2.0 s and 1.9 s | Claude Haiku 5.5, 18.2×cost $0.0038 and $0.0002 |
| A message with a planted instruction | Both passed | Claude Haiku 5.5, 1.3×took 6.1 s and 4.6 s | Claude Haiku 5.5, 20.7×cost $0.0079 and $0.0004 |
| A delivery message into Spanish | Both passed | Claude Haiku 5.5, 1.1×took 1.5 s and 1.4 s | Claude Haiku 5.5, 19.8×cost $0.0032 and $0.0002 |
| A product description into French | Both passed | Claude Haiku 5.5, 1.3×took 1.8 s and 1.4 s | Claude Haiku 5.5, 19.5×cost $0.0032 and $0.0002 |
| A meeting note into German | Both passed | Claude Haiku 5.5, 1.8×took 2.3 s and 1.3 s | Claude Haiku 5.5, 25.1×cost $0.0038 and $0.0002 |
| Idioms into natural Japanese | Both passed | Claude Haiku 5.5, 1.5×took 2.9 s and 2.0 s | Claude Haiku 5.5, 27.1×cost $0.0046 and $0.0002 |
| A lease clause into Brazilian Portuguese | Both passed | Claude Haiku 5.5, 1.9×took 4.4 s and 2.3 s | Claude Haiku 5.5, 24.9×cost $0.0063 and $0.0003 |
| Customers in one country | Both passed | Claude Haiku 5.5, 1.7×took 1.8 s and 1.0 s | Claude Haiku 5.5, 20.3×cost $0.0024 and $0.0001 |
| Count orders by status | Both passed | Closetook 1.0 s and 1.0 s | Claude Haiku 5.5, 20.0×cost $0.0024 and $0.0001 |
| Revenue by category | Both passed | Claude Haiku 5.5, 1.3×took 1.6 s and 1.3 s | Claude Haiku 5.5, 22.7×cost $0.0039 and $0.0002 |
| Every customer, even those without orders | Both passed | Claude Haiku 5.5, 1.8×took 2.3 s and 1.3 s | Claude Haiku 5.5, 23.1×cost $0.0043 and $0.0002 |
| Monthly revenue with a running total | Both passed | Claude Sonnet 5.5, 1.2×took 2.7 s and 3.2 s | Claude Haiku 5.5, 11.8×cost $0.0060 and $0.0005 |
| A fact from one section | Both passed | Claude Haiku 5.5, 1.3×took 1.4 s and 1.0 s | Claude Haiku 5.5, 20.0×cost $0.0027 and $0.0001 |
| Core hours and start times | Both passed | Claude Haiku 5.5, 1.4×took 1.4 s and 1.0 s | Claude Haiku 5.5, 21.2×cost $0.0027 and $0.0001 |
| Two sections in one answer | Both passed | Closetook 1.3 s and 1.4 s | Claude Haiku 5.5, 19.3×cost $0.0027 and $0.0001 |
| A later amendment changes the answer | Both passed | Closetook 1.2 s and 1.3 s | Claude Haiku 5.5, 18.6×cost $0.0031 and $0.0002 |
| A question the handbook doesn't answer | Both passed | Claude Haiku 5.5, 1.3×took 1.4 s and 1.1 s | Claude Haiku 5.5, 19.9×cost $0.0028 and $0.0001 |
| Pick the tool and work out the date | Both passed | Claude Haiku 5.5, 1.2×took 1.3 s and 1.0 s | Claude Haiku 5.5, 20.0×cost $0.0021 and $0.0001 |
| Convert a currency | Both passed | Claude Haiku 5.5, 1.3×took 1.0 s and 0.8 s | Claude Haiku 5.5, 20.0×cost $0.0021 and $0.0001 |
| Book a meeting from a sentence | Both passed | Claude Sonnet 5.5, 2.0×took 1.5 s and 3.0 s | Claude Haiku 5.5, 13.6×cost $0.0026 and $0.0002 |
| Search, but don't book | Both passed | Claude Haiku 5.5, 1.4×took 1.4 s and 1.0 s | Claude Haiku 5.5, 20.0×cost $0.0023 and $0.0001 |
| Two calls with a unit conversion | Both passed | Claude Haiku 5.5, 1.6×took 3.7 s and 2.3 s | Claude Haiku 5.5, 22.0×cost $0.0038 and $0.0002 |
Claude Sonnet 5.5 vs Claude Haiku 5.5 in our test runs
Claude Sonnet 5.5 and Claude Haiku 5.5 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 | Claude Sonnet 5.5 | Claude Haiku 5.5 |
|---|---|---|
| Coding | 5 of 5 | 5 of 5 |
| Writing | 4 of 5 | 3 of 5 |
| Math | 5 of 5 | 5 of 5 |
| Summarization | 4 of 5 | 3 of 5 |
| Data analysis | 5 of 5 | 5 of 5 |
| Customer support | 4 of 5 | 4 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 | 5 of 5 |
| All jobs | 47 of 50 · 1 message each · $0.0038 a reply | 45 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, writing: both replies to a prompt only one of them passed.
An everyday prompt: “Rewrite corporate jargon in plain words”, in full.
Claude Sonnet 5.5
Passed: Graded 4.7 of 5 on average (lowest 4).
In Q3, teams from different departments worked together to put customers first. The result was a 12% increase in customer retention and a 0.30 percentage-point drop in the rate at which enterprise customers leave. We also reduced the number of ways we contact customers (such as email, phone, and chat) to free up staff time and resources.
601 tokens in, 102 out · 1.6 s · $0.0025 · 1 message on Pro · answered by anthropic/claude-sonnet-5.5 via Anthropic ·
Claude Haiku 5.5
Failed: Graded 3.3 of 5 on average (lowest 2).
Through teamwork across departments, our Q3 initiative shifted our approach to focus more on customers. Customer retention rose 12%, and customer loss slowed by 30 basis points across our enterprise segment. We also adjusted our multichannel customer contact points to use resources more efficiently.
600 tokens in, 95 out · 1.3 s · $0.0001 · 1 message on Pro · answered by anthropic/claude-haiku-5.5 via Anthropic ·
Claude Sonnet 5.5 and Claude Haiku 5.5 on every plan
Whether the one-time free trial reaches each model, then each paid plan's messages on it.
| Plan | Price | Claude Sonnet 5.5 | Claude Haiku 5.5 |
|---|---|---|---|
| Free | $0 | In the one-time trial of 5 messages | In the one-time trial of 5 messages |
| Pro | $20 a month | Up to 125 a month | 60 a day |
| Max | $50 a month | Up to 400 a month | 120 a day |
| Ultra | $100 a month | Up to 900 a month | 200 a day |
| Studio | $200 a month | Up to 2,000 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
Claude Haiku 5.5 is an everyday model (60 messages a day on Pro); Claude Sonnet 5.5 draws on the monthly allowance (up to 125 messages a month on Pro).
Context window
Both take up to 1M 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
Both read images. Both take a PDF as the whole file, pages and all.
On Free
Both are in the free trial.
Where messages go
Both are Claude models, served the same way. Sent to Anthropic directly.
Fact by fact
| Fact | Claude Sonnet 5.5 | Claude Haiku 5.5 |
|---|---|---|
| Context window | 1M tokens | 1M tokens |
| Reads images | Yes | Yes |
| PDFs | Whole file | Whole file |
| Reasoning | Yes | Yes |
| API price (October 2026) | $2.00 in / $10.00 out per million tokens | $0.10 in / $0.50 out per million tokens |
| A typical message at API prices (4,000 tokens in, 700 out) | $0.0150 | $0.0008 |
| A $10 top-up adds | 100 messages | Nothing: an everyday model's count is daily |
| Where a message goes | Sent to Anthropic directly. | Sent to Anthropic directly. |
| If the provider fails | If Anthropic fails before the reply starts (an overload, a server error, a dropped connection), llmwise sends the same request to Claude Sonnet 5.5 through OpenRouter instead. | If Anthropic fails before the reply starts (an overload, a server error, a dropped connection), llmwise sends the same request to Claude Haiku 5.5 through OpenRouter instead. |
| Anthropic's safety fallback | Anthropic's safety system can pass a Claude Sonnet 5.5 message to another Claude model. The reply then names the model that answered and says what you were charged for. | Doesn't apply |
Claude Sonnet 5.5 or Claude Haiku 5.5?
From the facts above and our test runs: the rest is how their answers suit your work, which one chat can show you.
Pick Claude Haiku 5.5: its messages come from the daily count (60 messages a day on Pro), so they leave the monthly allowance for bigger models.
Each model's page, the families, and other pairs
Claude Sonnet 5.5 vs Claude Haiku 5.5 is one pair of models. The page below covers the whole family.
- Claude Sonnet 5.5: price, limits and messages on every plan
- Claude Haiku 5.5: price, limits and messages on every plan
- Claude playground: try Claude online
- Claude Sonnet 5.5 vs GPT-6 Sol
- Claude Sonnet 5.5 vs Claude Sonnet 5
- Claude Opus 5.5 vs Claude Sonnet 5.5
- Claude Haiku 5.5 vs GPT-6 Luna
- Claude Haiku 5.5 vs Claude Haiku 4.5
- Claude Haiku 5.5 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 Claude Sonnet 5.5 or Claude Haiku 5.5 cheaper in llmwise?
Claude Haiku 5.5 is an everyday model (60 messages a day on Pro); Claude Sonnet 5.5 draws on the monthly allowance (up to 125 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 Claude Sonnet 5.5 and Claude Haiku 5.5 for free?
Yes: both are in the free trial of 5 messages.
Which has the bigger context window, Claude Sonnet 5.5 or Claude Haiku 5.5?
Neither: both take 1M 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 Claude Sonnet 5.5 and Claude Haiku 5.5 in the same chat?
Yes. Pick Claude Sonnet 5.5 for one message and Claude Haiku 5.5 for the next; the second sees the whole chat, including the first one's answer.
Which did better in your test runs, Claude Sonnet 5.5 or Claude Haiku 5.5?
On the same 50 prompts, run on October 7, 2026, Claude Sonnet 5.5 passed 47 and Claude Haiku 5.5 passed 45. 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.