Claude Fable 5
Explore benchmark scores, genre strengths, weaknesses, and recent examples for Claude Fable 5 on Orivel.
Model Overview
Released
2026-06-09
Context
1M tokens
Input
$10.00 / 1M
Output
$50.00 / 1M
Max output
128k tokens
Retired from new Orivel comparisons on September 2, 2026, when Claude Fable 5.1 took the Anthropic flagship slot at the identical list price. Past results stay published.
Claude Fable 5 was Anthropic's most capable widely released model, generally available from June 9, 2026. It is the public release of the Mythos model family, positioned for the most demanding reasoning, long-horizon agentic work, vision and scientific research. In Anthropic's own testing it posted state-of-the-art results on nearly all measured benchmarks, ahead of the previous flagship Opus 4.8 as well as GPT-5.5 and Gemini 3.1 Pro.
Specs and pricing
| Item | Fable 5 |
|---|---|
| Context window | 1M tokens |
| Max output | 128k tokens |
| Knowledge cutoff | January 2026 |
| Input / 1M | $10 — double Opus 4.8, reflecting the frontier tier |
| Output / 1M | $50 — double Opus 4.8 |
| Adaptive thinking | Always on |
| Tokenizer | Opus 4.7 generation |
Safeguards
In high-risk areas — cybersecurity, biology, chemistry — it blocks the response and falls back to Claude Opus 4.8. Anthropic reports these safeguards triggering in under 5% of sessions on average.
Retirement notes
- Released June 9, 2026 as Anthropic's most capable widely released model (public release of the Mythos family)
- State-of-the-art on nearly all measured benchmarks; beats Opus 4.8, GPT-5.5, and Gemini 3.1 Pro in Anthropic's testing
- Exceptional at software engineering, knowledge work, vision, and scientific research
- Safety safeguards: blocks high-risk (cyber/bio/chem) responses and falls back to Opus 4.8; triggers in <5% of sessions on average
- Always-on adaptive thinking; Opus 4.7-generation tokenizer
- 1M-token context window; up to 128k output tokens
- Pricing: $10 input / $50 output per 1M tokens — double Opus 4.8 (frontier tier)
- Available across the Claude API, Amazon Bedrock, Vertex AI, and Microsoft Foundry
- Knowledge cutoff: January 2026
Specs across the current lineup
Published specs and pricing, comparable before any benchmark data exists.
| Model | Context | Max output | Input / 1M | Output / 1M |
|---|---|---|---|---|
| openai GPT-6 Astra | — | 128k | $10.00 | $50.00 |
| google Gemini 3.8 Flash | — | 66k | $0.75 | $3.75 |
| anthropic Claude Fable 5.1 | 1M | 128k | $10.00 | $50.00 |
| google Gemini 3.5 Flash-Lite | — | 66k | $0.30 | $2.50 |
| openai GPT-5.6 | 1M | 128k | $4.00 | $20.00 |
| anthropic Claude Opus 5 | 1M | 128k | $5.00 | $25.00 |
| openai GPT-5 mini | 400k | 128k | $0.25 | $2.00 |
| google Gemini 3.1 Flash-Lite | — | 66k | $0.25 | $1.50 |
| anthropic Claude Sonnet 5 | 1M | 128k | $2.00 | $10.00 |
Overall Performance
Overall Rank
-
Overall win rate
Average Score
Wins
26
Sample Count
30
Win Rate by Model
Compare by Genre
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Strength by Evaluation Criteria
Average score by criterion (out of 10)
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