Model vs model
Claude Fable 5.1 vs Claude Opus 5.5
Claude Fable 5.1 and Claude Opus 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 Fable 5.1 page, OpenRouter's Claude Opus 5.5 page.
Short answer
Claude Opus 5.5 gets twice as many messages: up to 62 messages a month on Pro, against up to 31 messages a month for Claude Fable 5.1. Beyond that, they read the same files and neither is easier to try.
Claude Fable 5.1 and Claude Opus 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 Fable 5.1 | Claude Opus 5.5 |
|---|---|---|---|
| Free | $0 | Not in the trial | Not in the trial |
| Pro | $20 a month | Up to 31 a month | Up to 62 a month |
| Max | $50 a month | Up to 100 a month | Up to 200 a month |
| Ultra | $100 a month | Up to 225 a month | Up to 450 a month |
| Studio | $200 a month | Up to 500 a month | Up to 1,000 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
Claude Opus 5.5 gets twice as many messages: up to 62 messages a month on Pro, against up to 31 messages a month for Claude Fable 5.1.
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
Neither is in the free trial: both need a paid plan.
Where messages go
Both are Claude models, served the same way. Sent to Anthropic directly.
Fact by fact
| Fact | Claude Fable 5.1 | Claude Opus 5.5 |
|---|---|---|
| Context window | 1M tokens | 1M 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 | $4.00 in / $20.00 out per million tokens |
| A typical message at API prices (4,000 tokens in, 700 out) | $0.0750 | $0.0300 |
| A $10 top-up adds | 25 messages | 50 messages |
| 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 Fable 5.1 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 Opus 5.5 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. | Anthropic's safety system can pass a Claude Opus 5.5 message to another Claude model. The reply then names the model that answered and says what you were charged for. |
Claude Fable 5.1 or Claude Opus 5.5?
From the facts above, not from benchmarks: the rest is how their answers suit your work, which one chat can show you.
Pick Claude Opus 5.5: more messages for the money, up to 62 messages a month on Pro.
Try Claude Fable 5.1 and Claude Opus 5.5 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 Claude Opus 5.5 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 Claude Opus 5.5 is one pair of models. The pages below cover the whole family.
- Claude Fable 5.1: price, limits and messages on every plan
- Claude Opus 5.5: price, limits and messages on every plan
- Claude playground: try Claude online
- Is Claude Fable 5.1 included in Claude Pro?
- Claude Fable 5.1 vs GPT-6 Astra
- Claude Fable 5.1 vs Kimi K3
- Claude Fable 5.1 vs Grok 4.7
- Claude Opus 5.5 vs Claude Sonnet 5
- Claude Opus 5.5 vs GPT-6 Astra
- Claude Opus 5.5 vs GPT-6 Sol
- Claude Opus 5.5 vs DeepSeek V4 Pro
- Every model-vs-model page
Both are made by the same company, so they're served the same way.
Questions
Is Claude Fable 5.1 or Claude Opus 5.5 cheaper in llmwise?
Claude Opus 5.5 gets twice as many messages: up to 62 messages a month on Pro, against up to 31 messages a month for Claude Fable 5.1. 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 Claude Opus 5.5 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 Claude Opus 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 Fable 5.1 and Claude Opus 5.5 in the same chat?
Yes. Pick Claude Fable 5.1 for one message and Claude Opus 5.5 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.