Claude Fable 5.1: Benchmarks, Pricing & Context Window
Claude Fable 5.1 is a language model from Anthropic, released in September 2026, with multimodal input, a 1M-token context window, and pricing from $10.00/M input, $0.250/M cached input, $50.00/M output.
Claude Fable 5.1 is Anthropic's generally available, production-safeguarded deployment of the same underlying weights as Claude Mythos 5.1 (trusted-access only via CVP/LSVP; not cataloged here). It targets demanding reasoning and
Claude Fable 5.1 benchmarks
Capability tiers
Standing within each category, adjusted for leaderboard depth.
Real tasks performance
High-confidence performance for Claude Fable 5.1 across real-world prompt categories. Only 95% intervals at most 4 points wide are shown.
Performance by conversation depth
How Claude Fable 5.1 holds up as conversations get longer.
Quality Tracker
Claude Fable 5.1 Performance Across Datasets
Scores sourced from the model's scorecard, paper, or official blog posts
llm-stats.com - Sat Sep 12 2026Claude Fable 5.1 pricing
Providers
Claude Fable 5.1 starts at $10.00 per million input tokens and $50.00 per million output tokens via Anthropic. Reused prompt prefixes cost $0.250 per million cached input tokens.
| Provider | Input $/M | Cached input $/M | Output $/M | Context in / out | TTFT p95 s | Output p5 c/s | Modalities in / out |
|---|---|---|---|---|---|---|---|
 Anthropic | $10.00 | $0.250 | $50.00 | 1.0M/128.0K | 16.15 | 1 | / |
Cached input is the discounted price for prompt tokens served from a provider cache. TTFT is time to first token. Output is characters per second; p5 is the sustained floor exceeded by 95% of observed requests.
Claude Fable 5.1 context window
Input and output token limits for Claude Fable 5.1, plus how it ranks on long-context understanding.
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Claude Fable 5.1 latency
Claude Fable 5.1 time to first token, sustained output throughput, and failed-request rate from live model usage over the trailing 7 days.
Provider operational metrics
Time to first token, output throughput, and failed-request rate from live model usage
Claude Fable 5.1 examples
Recent arena outputs from Claude Fable 5.1, picked from the highest-ranked matchups.
Claude Fable 5.1 license
Claude Fable 5.1 is a proprietary model available under its provider's product and API terms.
- License
- Proprietary
- Hosted access
Proprietary license - usage restrictions apply
Claude Fable 5.1 resources
Official sources for Claude Fable 5.1: provider documentation, official playground, paper or system card, official launch post.
Claude Fable 5.1 vs other models
The most-compared alternatives to Claude Fable 5.1 are Claude Mythos Preview, GPT-6 Astra, Kimi K3. Open any pair side-by-side for benchmarks, pricing, context, and latency.
Models like Claude Fable 5.1
Models ranked just above and below Claude Fable 5.1 by LLM Stats score.
FAQ
Common questions about Claude Fable 5.1.