Claude Fable 5.1
by Anthropicanthropic/claude-fable-5.1
LLMCompare cannot run Claude Fable 5.1 yet.No route to this model is configured on this site yet. Its prices and parameters are listed below for reference.
See the models that can be run nowClaude Fable 5.1 at a glance
- Context length
- 1,000,000 tokens
- Maximum output
- 128,000 tokens
- Accepts
- Text, Image, File
- Returns
- Text
- Features
- ReasoningJSON outputTool callingPrompt cachingImage input
- Reasoning effort levels
maxxhighhighmediumlowReasoning is always on for this model.- Released
- 1 Sep 2026
- Knowledge cutoff
- Not published
Model facts synced from the OpenRouter model list on 21 Oct 2026.
Claude Fable 5.1 pricing by route
A route is the service LLMCompare calls to reach the model. Claude Fable 5.1 has 1 route. Prices are in US dollars.
| Route | On LLMCompare | Inputper 1M tokens | Outputper 1M tokens | Cache readper 1M tokens | Cache writeper 1M tokens | Price verified on | Source |
|---|---|---|---|---|---|---|---|
| OpenRouterDefault | Not configured | $10.00 | $50.00 | $0.25 | $12.50 | openrouter.ai/anthropic/claude-fable-5.1 |
The cost shown in an LLMCompare report is calculated from these prices as they were at the time of the run.
Cost calculator
Estimate what a batch of calls to Claude Fable 5.1 costs. The starting numbers are examples. Change them to match your task.
Part of the input tokens above, billed at the cache read price.
Billed in addition to the output tokens.
- Cost per call
- $0.035
- 42 credits
- Cost of 100 calls
- $3.50
- 4,200 credits
Calculated from the OpenRouter prices verified on 21 Oct 2026. Credits are the cost plus a 20% service fee, at $0.001 per credit, rounded up for each call, with a minimum of 1 per call. A real run is charged for the usage the provider reports.
Parameters you can set
These are the parameters LLMCompare can set when it calls the model through OpenRouter.
| Parameter | Type | Range or options | Default |
|---|---|---|---|
max_tokens | Integer | 1 to 128,000 | Provider default |
reasoning_effort | One of | maxxhighhighmediumlow | high |
response_format | One of | textjson_object | Provider default |
About Claude Fable 5.1
Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...
Description as published for this model. LLMCompare has not edited it.
Models to compare with Claude Fable 5.1
Text models from the same provider and models at the nearest price. The order is not a ranking.
| Add to comparison | Model | Context | Max output | Input priceper 1M tokens | Output priceper 1M tokens | Features | Released | On LLMCompare |
|---|---|---|---|---|---|---|---|---|
Claude Fable 5Anthropicanthropic/claude-fable-5 | 1M | 128k | $10.00 | $50.00 | ReasoningJSONToolsCacheVision | No route yet | ||
Claude Opus 4.1Anthropicanthropic/claude-opus-4.1 | 200k | 32k | $15.00 | $75.00 | ToolsCacheVision | No route yet | ||
Claude Opus 5Anthropicanthropic/claude-opus-5 | 1M | 128k | $5.00 | $25.00 | ReasoningJSONToolsCacheVision | No route yet | ||
GPT-6 AstraOpenAIopenai/gpt-6-astra | 1.05M | 128k | $10.00 | $50.00 | ReasoningJSONToolsCacheVision | No route yet | ||
GPT-6 Astra ProOpenAIopenai/gpt-6-astra-pro | 1.05M | 128k | $10.00 | $50.00 | ReasoningJSONToolsCacheVision | No route yet | ||
o1OpenAIopenai/o1 | 200k | 100k | $15.00 | $60.00 | JSONToolsCacheVision | No route yet |
Questions about Claude Fable 5.1
- How much does Claude Fable 5.1 cost?
- On the OpenRouter route, Claude Fable 5.1 costs $10.00 per 1 million input tokens and $50.00 per 1 million output tokens, in US dollars. Input tokens that Claude Fable 5.1 reads from the prompt cache cost $0.25 per 1 million tokens. LLMCompare verified this price on 21 Oct 2026.
- What is the context length of Claude Fable 5.1?
- Claude Fable 5.1 has a context length of 1,000,000 tokens and returns up to 128,000 output tokens in one call.
- What inputs does Claude Fable 5.1 accept?
- Claude Fable 5.1 accepts these inputs: Text, Image, File. Claude Fable 5.1 returns: Text.
- Which reasoning effort levels does Claude Fable 5.1 support?
- Claude Fable 5.1 supports these reasoning effort levels: max, xhigh, high, medium, low. Reasoning is always on for Claude Fable 5.1 and cannot be turned off.
- Can I test Claude Fable 5.1 on my own data?
- Not yet. LLMCompare lists the prices and parameters of Claude Fable 5.1, but no route to Claude Fable 5.1 is configured on LLMCompare, so it cannot be selected for an evaluation.