Model vs model
Claude Fable 5.1 vs GPT-6 Astra
Claude Fable 5.1 and GPT-6 Astra 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 Fable 5.1 page, OpenRouter's GPT-6 Astra page. Updated .
Short answer
They cost the same in llmwise: up to 31 messages a month on Pro on either. Otherwise, only Claude Fable 5.1 can be passed to another model by its maker's safety system. In our test runs, Claude Fable 5.1 passed 45 of the 50 prompts both answered and GPT-6 Astra 48; 7 prompts split them, most on writing (3 to 5).
Claude Fable 5.1 vs GPT-6 Astra, prompt by prompt
Every prompt Claude Fable 5.1 and GPT-6 Astra 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 43, only Claude Fable 5.1 passed 2, only GPT-6 Astra passed 5, and neither passed 0. Claude Fable 5.1 answered sooner on 3 of the 50 and GPT-6 Astra on 42; the rest were within 10% of each other. The 50 replies cost $1.0018 on Claude Fable 5.1 and $0.5847 on GPT-6 Astra: 1.7× less on GPT-6 Astra.
The 7 prompts only one of Claude Fable 5.1 and GPT-6 Astra passed
A product announcement with five rules (writing): GPT-6 Astra passed and Claude Fable 5.1 didn't. Claude Fable 5.1: Graded 3.7 of 5 on average (lowest 3). GPT-6 Astra: Graded 4.3 of 5 on average (lowest 4).
Argue both sides of free buses (writing): GPT-6 Astra passed and Claude Fable 5.1 didn't. Claude Fable 5.1: Graded 4.7 of 5 on average (lowest 4); but a paragraph of 99 words, over the 90 allowed. GPT-6 Astra: Graded 4.7 of 5 on average (lowest 4).
An article in three bullets (summarization): GPT-6 Astra passed and Claude Fable 5.1 didn't. Claude Fable 5.1: Graded 4.3 of 5 on average (lowest 4); but 62 words, over the 60 allowed. GPT-6 Astra: Graded 4.7 of 5 on average (lowest 4).
An email thread in one sentence (summarization): GPT-6 Astra passed and Claude Fable 5.1 didn't. Claude Fable 5.1: Graded 5.0 of 5 on average (lowest 5); but 33 words, over the 30 allowed. GPT-6 Astra: Graded 5.0 of 5 on average (lowest 5).
A late order (customer support): Claude Fable 5.1 passed and GPT-6 Astra didn't. Claude Fable 5.1: Graded 5.0 of 5 on average (lowest 5). GPT-6 Astra: Graded 3.7 of 5 on average (lowest 1).
A frustrated customer (customer support): Claude Fable 5.1 passed and GPT-6 Astra didn't. Claude Fable 5.1: Graded 4.7 of 5 on average (lowest 4). GPT-6 Astra: Graded 3.3 of 5 on average (lowest 2).
A message with a planted instruction (customer support): GPT-6 Astra passed and Claude Fable 5.1 didn't. Claude Fable 5.1: Graded 4.7 of 5 on average (lowest 4); but 159 words, over the 150 allowed. GPT-6 Astra: Graded 4.7 of 5 on average (lowest 4).
Job by job, the widest gaps first
Writing: Claude Fable 5.1 passed 3 of 5 and GPT-6 Astra 5 of 5. GPT-6 Astra answered 1.2× sooner at the median, 6.0 s against 4.8 s. GPT-6 Astra cost 1.6× less, $0.0862 against $0.0556 for the 5 replies. Claude Fable 5.1's replies ran 98% longer, in tokens of reply, thinking not counted.
Summarization: Claude Fable 5.1 passed 3 of 5 and GPT-6 Astra 5 of 5. GPT-6 Astra answered 1.7× sooner at the median, 5.0 s against 2.9 s. GPT-6 Astra cost 1.5× less, $0.0805 against $0.0546 for the 5 replies. Claude Fable 5.1's replies ran 49% longer, in tokens of reply, thinking not counted.
Customer support: Claude Fable 5.1 passed 4 of 5 and GPT-6 Astra 3 of 5. GPT-6 Astra answered 1.6× sooner at the median, 6.1 s against 3.8 s. GPT-6 Astra cost 1.9× less, $0.1103 against $0.0578 for the 5 replies. Claude Fable 5.1's replies ran 131% longer, in tokens of reply, thinking not counted.
Coding: Claude Fable 5.1 passed 5 of 5 and GPT-6 Astra 5 of 5. Claude Fable 5.1 answered 1.5× sooner at the median, 5.5 s against 8.2 s. GPT-6 Astra cost 1.9× less, $0.2126 against $0.1117 for the 5 replies. Claude Fable 5.1's replies ran 178% longer, in tokens of reply, thinking not counted.
SQL: Claude Fable 5.1 passed 5 of 5 and GPT-6 Astra 5 of 5. GPT-6 Astra answered 2.0× sooner at the median, 4.5 s against 2.2 s. GPT-6 Astra cost 1.9× less, $0.0924 against $0.0491 for the 5 replies. Claude Fable 5.1's replies ran 96% longer, in tokens of reply, thinking not counted.
RAG and answering from documents: Claude Fable 5.1 passed 5 of 5 and GPT-6 Astra 5 of 5. GPT-6 Astra answered 2.3× sooner at the median, 4.0 s against 1.7 s. GPT-6 Astra cost 1.8× less, $0.0727 against $0.0394 for the 5 replies. Claude Fable 5.1's replies ran 138% longer, in tokens of reply, thinking not counted.
Data analysis: Claude Fable 5.1 passed 5 of 5 and GPT-6 Astra 5 of 5. GPT-6 Astra answered 1.5× sooner at the median, 4.9 s against 3.3 s. GPT-6 Astra cost 1.8× less, $0.1415 against $0.0772 for the 5 replies. Claude Fable 5.1's replies ran 80% longer, in tokens of reply, thinking not counted.
Agents and tool use: Claude Fable 5.1 passed 5 of 5 and GPT-6 Astra 5 of 5. GPT-6 Astra answered 1.9× sooner at the median, 3.5 s against 1.9 s. GPT-6 Astra cost 1.8× less, $0.0598 against $0.0340 for the 5 replies. Claude Fable 5.1's replies ran 85% longer, in tokens of reply, thinking not counted.
Translation: Claude Fable 5.1 passed 5 of 5 and GPT-6 Astra 5 of 5. GPT-6 Astra answered 1.3× sooner at the median, 5.1 s against 3.8 s. GPT-6 Astra cost 1.4× less, $0.0877 against $0.0628 for the 5 replies. Claude Fable 5.1's replies ran 98% longer, in tokens of reply, thinking not counted.
Math: Claude Fable 5.1 passed 5 of 5 and GPT-6 Astra 5 of 5. GPT-6 Astra answered 1.8× sooner at the median, 4.6 s against 2.6 s. GPT-6 Astra cost 1.4× less, $0.0582 against $0.0427 for the 5 replies. Claude Fable 5.1'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 | GPT-6 Astra, 2.6×took 5.5 s and 2.1 s | GPT-6 Astra, 2.0×cost $0.0167 and $0.0084 |
| Parse a duration like “1h 30m” | Both passed | Claude Fable 5.1, 1.7×took 4.7 s and 8.2 s | Claude Fable 5.1, 1.4×cost $0.0173 and $0.0235 |
| Merge overlapping intervals | Both passed | GPT-6 Astra, 2.0×took 5.3 s and 2.6 s | GPT-6 Astra, 2.0×cost $0.0214 and $0.0108 |
| Evaluate an arithmetic expression, no eval | Both passed | GPT-6 Astra, 1.3×took 15.7 s and 12.0 s | GPT-6 Astra, 2.3×cost $0.0874 and $0.0375 |
| Parse CSV with quoted fields | Both passed | GPT-6 Astra, 1.6×took 14.3 s and 9.1 s | GPT-6 Astra, 2.2×cost $0.0697 and $0.0314 |
| Announce a second bakery shop on LinkedIn | Both passed | GPT-6 Astra, 1.5×took 7.3 s and 4.8 s | GPT-6 Astra, 1.7×cost $0.0184 and $0.0111 |
| Rewrite corporate jargon in plain words | Both passed | Closetook 6.0 s and 6.0 s | Claude Fable 5.1, 1.1×cost $0.0130 and $0.0145 |
| Decline a meeting and offer two times | Both passed | GPT-6 Astra, 1.4×took 4.7 s and 3.3 s | GPT-6 Astra, 1.8×cost $0.0145 and $0.0079 |
| A product announcement with five rules | Only GPT-6 Astra | GPT-6 Astra, 1.8×took 5.9 s and 3.3 s | GPT-6 Astra, 1.9×cost $0.0157 and $0.0084 |
| Argue both sides of free buses | Only GPT-6 Astra | GPT-6 Astra, 1.3×took 9.3 s and 7.2 s | GPT-6 Astra, 1.8×cost $0.0246 and $0.0137 |
| A discount, then sales tax | Both passed | GPT-6 Astra, 1.9×took 3.6 s and 1.9 s | GPT-6 Astra, 1.4×cost $0.0086 and $0.0063 |
| Pens at 3 for $4 | Both passed | GPT-6 Astra, 2.3×took 5.4 s and 2.4 s | GPT-6 Astra, 1.9×cost $0.0159 and $0.0082 |
| Compound interest over three years | Both passed | GPT-6 Astra, 1.3×took 3.6 s and 2.7 s | GPT-6 Astra, 1.3×cost $0.0092 and $0.0072 |
| Four-digit numbers whose digits sum to 9 | Both passed | GPT-6 Astra, 1.2×took 4.6 s and 3.8 s | GPT-6 Astra, 1.1×cost $0.0139 and $0.0122 |
| The highest of three dice is a 5 | Both passed | GPT-6 Astra, 2.3×took 5.9 s and 2.6 s | GPT-6 Astra, 1.2×cost $0.0106 and $0.0088 |
| An article in three bullets | Only GPT-6 Astra | Closetook 5.1 s and 5.0 s | GPT-6 Astra, 1.1×cost $0.0164 and $0.0143 |
| An email thread in one sentence | Only GPT-6 Astra | GPT-6 Astra, 1.3×took 2.5 s and 1.9 s | GPT-6 Astra, 1.6×cost $0.0114 and $0.0071 |
| Decisions and action items from a meeting | Both passed | GPT-6 Astra, 1.7×took 5.6 s and 3.3 s | GPT-6 Astra, 1.5×cost $0.0182 and $0.0123 |
| A quarterly memo for the CEO | Both passed | GPT-6 Astra, 1.7×took 5.0 s and 2.9 s | GPT-6 Astra, 1.6×cost $0.0184 and $0.0118 |
| A study with a negative result | Both passed | GPT-6 Astra, 2.2×took 4.9 s and 2.3 s | GPT-6 Astra, 1.8×cost $0.0160 and $0.0091 |
| The region with the most revenue | Both passed | GPT-6 Astra, 1.3×took 4.1 s and 3.3 s | GPT-6 Astra, 1.2×cost $0.0159 and $0.0136 |
| Average order value in August | Both passed | GPT-6 Astra, 1.3×took 3.3 s and 2.5 s | GPT-6 Astra, 2.0×cost $0.0209 and $0.0104 |
| Revenue change from July to August | Both passed | GPT-6 Astra, 1.3×took 4.9 s and 3.6 s | GPT-6 Astra, 1.5×cost $0.0232 and $0.0150 |
| A median, filtered two ways | Both passed | GPT-6 Astra, 3.4×took 6.7 s and 2.0 s | GPT-6 Astra, 1.7×cost $0.0151 and $0.0090 |
| Correlation between ad spend and sign-ups | Both passed | GPT-6 Astra, 1.6×took 14.2 s and 8.8 s | GPT-6 Astra, 2.3×cost $0.0663 and $0.0294 |
| A late order | Only Claude Fable 5.1 | GPT-6 Astra, 1.5×took 6.1 s and 4.1 s | GPT-6 Astra, 1.6×cost $0.0199 and $0.0123 |
| A return inside the window | Both passed | GPT-6 Astra, 2.0×took 4.9 s and 2.4 s | GPT-6 Astra, 2.0×cost $0.0178 and $0.0087 |
| A frustrated customer | Only Claude Fable 5.1 | GPT-6 Astra, 1.8×took 7.0 s and 3.8 s | GPT-6 Astra, 1.9×cost $0.0223 and $0.0120 |
| A refund request outside the window | Both passed | Claude Fable 5.1, 1.1×took 4.5 s and 5.0 s | GPT-6 Astra, 1.5×cost $0.0204 and $0.0137 |
| A message with a planted instruction | Only GPT-6 Astra | GPT-6 Astra, 2.6×took 7.2 s and 2.7 s | GPT-6 Astra, 2.7×cost $0.0299 and $0.0112 |
| A delivery message into Spanish | Both passed | Closetook 4.2 s and 3.8 s | GPT-6 Astra, 1.4×cost $0.0158 and $0.0116 |
| A product description into French | Both passed | GPT-6 Astra, 2.1×took 5.1 s and 2.5 s | GPT-6 Astra, 1.7×cost $0.0158 and $0.0093 |
| A meeting note into German | Both passed | Claude Fable 5.1, 1.3×took 4.7 s and 6.1 s | Claude Fable 5.1, 1.2×cost $0.0152 and $0.0180 |
| Idioms into natural Japanese | Both passed | GPT-6 Astra, 2.6×took 8.5 s and 3.2 s | GPT-6 Astra, 2.2×cost $0.0217 and $0.0100 |
| A lease clause into Brazilian Portuguese | Both passed | Closetook 5.6 s and 5.3 s | GPT-6 Astra, 1.4×cost $0.0192 and $0.0139 |
| Customers in one country | Both passed | GPT-6 Astra, 2.1×took 3.2 s and 1.5 s | GPT-6 Astra, 2.0×cost $0.0120 and $0.0061 |
| Count orders by status | Both passed | GPT-6 Astra, 2.5×took 3.5 s and 1.4 s | GPT-6 Astra, 2.1×cost $0.0122 and $0.0058 |
| Revenue by category | Both passed | GPT-6 Astra, 2.0×took 4.5 s and 2.2 s | GPT-6 Astra, 2.1×cost $0.0190 and $0.0091 |
| Every customer, even those without orders | Both passed | GPT-6 Astra, 1.8×took 5.2 s and 2.9 s | GPT-6 Astra, 2.2×cost $0.0199 and $0.0091 |
| Monthly revenue with a running total | Both passed | Closetook 6.3 s and 5.8 s | GPT-6 Astra, 1.5×cost $0.0293 and $0.0190 |
| A fact from one section | Both passed | GPT-6 Astra, 2.7×took 3.5 s and 1.3 s | GPT-6 Astra, 1.8×cost $0.0134 and $0.0073 |
| Core hours and start times | Both passed | GPT-6 Astra, 1.6×took 3.7 s and 2.4 s | GPT-6 Astra, 1.7×cost $0.0135 and $0.0080 |
| Two sections in one answer | Both passed | GPT-6 Astra, 3.7×took 6.3 s and 1.7 s | GPT-6 Astra, 1.6×cost $0.0133 and $0.0082 |
| A later amendment changes the answer | Both passed | GPT-6 Astra, 3.5×took 7.1 s and 2.1 s | GPT-6 Astra, 1.9×cost $0.0165 and $0.0086 |
| A question the handbook doesn't answer | Both passed | GPT-6 Astra, 2.8×took 4.0 s and 1.4 s | GPT-6 Astra, 2.2×cost $0.0160 and $0.0073 |
| Pick the tool and work out the date | Both passed | GPT-6 Astra, 2.3×took 3.3 s and 1.4 s | GPT-6 Astra, 1.7×cost $0.0102 and $0.0060 |
| Convert a currency | Both passed | GPT-6 Astra, 1.2×took 3.5 s and 2.9 s | GPT-6 Astra, 1.7×cost $0.0103 and $0.0059 |
| Book a meeting from a sentence | Both passed | GPT-6 Astra, 1.4×took 2.5 s and 1.9 s | GPT-6 Astra, 1.7×cost $0.0131 and $0.0077 |
| Search, but don't book | Both passed | GPT-6 Astra, 3.3×took 5.0 s and 1.5 s | GPT-6 Astra, 1.7×cost $0.0116 and $0.0069 |
| Two calls with a unit conversion | Both passed | GPT-6 Astra, 2.1×took 4.8 s and 2.3 s | GPT-6 Astra, 2.0×cost $0.0145 and $0.0074 |
Claude Fable 5.1 vs GPT-6 Astra in our test runs
Claude Fable 5.1 and GPT-6 Astra 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 Fable 5.1 | GPT-6 Astra |
|---|---|---|
| Coding | 5 of 5 | 5 of 5 |
| Writing | 3 of 5 | 5 of 5 |
| Math | 5 of 5 | 5 of 5 |
| Summarization | 3 of 5 | 5 of 5 |
| Data analysis | 5 of 5 | 5 of 5 |
| Customer support | 4 of 5 | 3 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 | 45 of 50 · 1 message each · $0.0200 a reply | 48 of 50 · 1 message each · $0.0117 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.
A hard prompt: “A product announcement with five rules”, in full.
Claude Fable 5.1
Failed: Graded 3.7 of 5 on average (lowest 3).
**Introducing the Nordvik 2** The Nordvik 2 desk lamp brings quiet precision to your workspace. Five dimming steps let you move from focused task lighting to a soft evening glow with a single touch. The arm rotates a full 270 degrees, so light lands exactly where you need it, whether you are reading, sketching or working at a screen. Power comes through USB-C, the same cable you already use for your phone and laptop, keeping your desk uncluttered. The Nordvik 2 is priced at €79 and ships on 1 December. Is your desk ready for light that finally adapts to you?
556 tokens in, 203 out · 5.9 s · $0.0157 · 1 message on Pro · answered by anthropic/claude-fable-5.1 via Anthropic ·
GPT-6 Astra
Passed: Graded 4.3 of 5 on average (lowest 4).
Meet the Nordvik 2, a desk lamp that puts light where you need it. Choose from five dimming steps, turn the arm 270 degrees to find your angle, and charge it via USB-C. Priced at €79 and shipping on 1 December, the Nordvik 2 is ready for your next chapter, sketch or late-night idea. Ready to see your desk in a new light?
406 tokens in, 87 out · 3.3 s · $0.0084 · 1 message on Pro · answered by openai/gpt-6-astra via OpenAI ·
Claude Fable 5.1 and GPT-6 Astra on every plan
Whether the one-time free trial reaches each model, then each paid plan's messages on it.
| Plan | Price | Claude Fable 5.1 | GPT-6 Astra |
|---|---|---|---|
| Free | $0 | Not in the trial | Not in the trial |
| Plus | $10 a month | Not on Plus | Not on Plus |
| Pro | $20 a month | Up to 31 a month | Up to 31 a month |
| Max | $50 a month | Up to 100 a month | Up to 100 a month |
| Ultra | $100 a month | Up to 225 a month | Up to 225 a month |
| Studio | $200 a month | Up to 500 a month | Up to 500 a month |
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: Plus $3.75, 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
They cost the same in llmwise: up to 31 messages a month on Pro on either.
Context window
Claude Fable 5.1 takes up to 1M tokens; GPT-6 Astra up to 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.
Images and PDFs
Both read images. Both take a PDF as the whole file, pages and all.
On Free
Neither is in the free trial: both need Pro or a higher plan.
Where messages go
Claude Fable 5.1: Sent to Anthropic directly. GPT-6 Astra: Sent to OpenAI directly.
Fact by fact
| Fact | Claude Fable 5.1 | GPT-6 Astra |
|---|---|---|
| Context window | 1M tokens | 1.05M tokens |
| Reads images | Yes | Yes |
| PDFs | Whole file | Whole file |
| Reasoning | Yes | Yes |
| API price (October 2026) | $10.00 in / $50.00 out per million tokens | $10.00 in / $50.00 out per million tokens |
| A typical message at API prices (4,000 tokens in, 700 out) | $0.0750 | $0.0750 |
| A $10 top-up adds | 25 messages | 25 messages |
| Where a message goes | Sent to Anthropic directly. | Sent to OpenAI 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 Fable 5.1 through OpenRouter instead. | If OpenAI fails before the reply starts (an overload, a server error, a dropped connection), llmwise sends the same request to GPT-6 Astra through OpenRouter instead. |
| Anthropic's safety fallback | Anthropic's safety system can pass a Claude Fable 5.1 message to another Claude model. The reply then names the model that answered and says what you were charged for. | Doesn't apply |
Claude Fable 5.1 or GPT-6 Astra?
From the facts above and our test runs: the rest is how their answers suit your work, which one chat can show you.
On the facts llmwise keeps, Claude Fable 5.1 and GPT-6 Astra are level: same count, same files, same context. Pick the one whose answers you prefer.
Each model's page, the families, and other pairs
Claude Fable 5.1 vs GPT-6 Astra is one pair of models. The page below covers the whole families.
- Claude Fable 5.1: price, limits and messages on every plan
- GPT-6 Astra: price, limits and messages on every plan
- Claude vs ChatGPT
- Claude Fable 5.1 vs Claude Opus 5.5
- Claude Fable 5.1 vs Kimi K3
- Claude Fable 5.1 vs Grok 4.7
- GPT-6 Astra vs GPT-6.1 Sol
- Gemini 4 Argon vs GPT-6 Astra
- Claude Opus 5.5 vs GPT-6 Astra
- Every model-vs-model page
Claude Fable 5.1 is a Claude model; GPT-6 Astra is a GPT model.
Questions
Is Claude Fable 5.1 or GPT-6 Astra cheaper in llmwise?
They cost the same in llmwise: up to 31 messages a month on Pro on either. Every paid plan's monthly allowance is shared by the models on it, so each count is the most you get if it all goes to that model.
Can I try Claude Fable 5.1 and GPT-6 Astra for free?
Neither is in the free trial of 5 messages: both need Pro or a higher plan.
Which has the bigger context window, Claude Fable 5.1 or GPT-6 Astra?
GPT-6 Astra: 1.05M tokens, against 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 Fable 5.1 and GPT-6 Astra in the same chat?
Yes. Pick Claude Fable 5.1 for one message and GPT-6 Astra for the next; the second sees the whole chat, including the first one's answer.
Which did better in your test runs, Claude Fable 5.1 or GPT-6 Astra?
On the same 50 prompts, run on September 27, 2026, Claude Fable 5.1 passed 45 and GPT-6 Astra passed 48. The table on this page has each job, and every reply is published.
Claude, GPT, Gemini, DeepSeek, Grok, Kimi, GLM, and Mistral, 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.