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.
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.
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 |
| 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: 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 a paid 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 (September 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, not from benchmarks: 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.
Try Claude Fable 5.1 and GPT-6 Astra on your own question
Start a chat on Claude Fable 5.1 and ask a real question from your work, with any files it needs.
Switch the model picker to GPT-6 Astra and ask for its answer to the same question. It sees the whole chat, including Claude Fable 5.1's answer.
Compare the two on what matters to you: accuracy, tone, length, how much you'd have to fix. If it's close, ask each a follow-up.
The badge by each model in the picker shows what a message uses before you send it.
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
- GPT vs Claude
- Claude Fable 5.1 vs Claude Opus 5.5
- Claude Fable 5.1 vs Kimi K3
- Claude Fable 5.1 vs Grok 4.7
- Claude Opus 5.5 vs GPT-6 Astra
- GPT-6 Astra vs GPT-6 Sol
- GPT-6 Astra vs Grok 4.7
- 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 all models, 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 a paid plan, from Pro.
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.
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.