Model Tracker
Claude Fable 5
Claude Fable 5 is an AI model made by Anthropic. Anthropic released it on 9 June 2026. It is generally available. Its context window is 1,000,000 tokens.
Claude Fable 5 is an AI model made by Anthropic. Anthropic released it on 9 June 2026. It is generally available. Its context window is 1,000,000 tokens. Its longest answer is 128,000 tokens. Through the API it costs $10.00 per 1M tokens for input and $50.00 per 1M tokens for output. Its knowledge cutoff is January 2026.
- Released
- 9 June 2026 — platform.claude.com, read 16 October 2026
- Status
- Generally available — platform.claude.com, read 16 October 2026
- Takes
- Text, Image — platform.claude.com, read 16 October 2026
- Returns
- Not confirmed: two readings disagree: text and text, code
- Open weights
- Not confirmed: The maker’s pages reviewed do not state whether Claude Fable 5 has open weights.
- Licence
- Not confirmed: The maker’s pages reviewed do not name a licence for Claude Fable 5.
- Context window
- 1,000,000 tokens — platform.claude.com, read 16 October 2026
- Longest answer
- 128,000 tokens — platform.claude.com, read 16 October 2026
- Knowledge cutoff
- January 2026 — platform.claude.com, read 16 October 2026
- API price, input
- $10.00 per 1M tokens — platform.claude.com, read 16 October 2026
- API price, output
- $50.00 per 1M tokens — platform.claude.com, read 16 October 2026
- Where
- Not confirmed: two readings disagree: api, app, cloud and api, app
- Parameters
- Not confirmed: The maker’s pages reviewed do not publish a parameter count for Claude Fable 5.
- Model card
- https://www-cdn.anthropic.com/57a52ea7d8f0e54e8a542e908266086df425cdf5/Claude%20Fable%205%20&%20Claude%20Mythos%205%20System%20Card.pdf — www.anthropic.com, read 16 October 2026
Benchmarks
Measured by others, not by the maker: each score with the name the measurer gives the model and the setting it ran, its day and its licence.
Arena
- Text Arena, Claude Fable 5 (High): 1,504 (1,499–1,508, 42,004 votes), published 15 October 2026
- Code Arena (WebDev), Claude Fable 5 (High): 1,624 (1,618–1,631, 15,785 votes), published 18 October 2026
- Vision Arena, claude-fable-5-high: 1,308 (1,301–1,315, 14,175 votes), published 9 October 2026
Arena’s leaderboard dataset (lmarena-ai/leaderboard-dataset on Hugging Face), CC BY 4.0: ratings from people’s votes between two anonymous models, as Arena publishes them. Data · CC BY 4.0
Epoch AI
- Epoch Capabilities Index, Claude Fable 5: 162.1 (159.5–166.3), as of 19 October 2026
- GPQA Diamond, claude-fable-5_max: 85.9% (± 2.5), run 6 August 2026
- GPQA Diamond, claude-fable-5_high: 83.3% (± 2.7), run 6 August 2026
- GPQA Diamond, claude-fable-5_low: 78.8% (± 2.9), run 6 August 2026
- FrontierMath, tiers 1–3, claude-fable-5_max: 87.0% (± 2.0), run 9 June 2026
- FrontierMath, tier 4, claude-fable-5_max: 90.2% (± 4.6), run 9 June 2026
- OTIS Mock AIME 2024–2025, claude-fable-5_high: 100.0% (± 0.0), run 6 August 2026
- OTIS Mock AIME 2024–2025, claude-fable-5_max: 99.7% (± 0.3), run 10 June 2026
- OTIS Mock AIME 2024–2025, claude-fable-5_low: 97.8% (± 2.2), run 6 August 2026
- SimpleQA Verified, claude-fable-5_xhigh: 70.7% (± 1.4), run 10 August 2026
Epoch AI, ‘Capabilities & benchmarking’, epoch.ai/benchmarks, CC BY 4.0: Epoch AI’s own runs and its Capabilities Index. Data · CC BY 4.0
Questions
When was Claude Fable 5 released?
Anthropic released Claude Fable 5 on 9 June 2026.
Is Claude Fable 5 still available?
Yes: it is generally available, as Anthropic states it.
What is the context window of Claude Fable 5?
The context window of Claude Fable 5 is 1,000,000 tokens, as Anthropic prints it.
How much does the Claude Fable 5 API cost?
On the standard tier, Claude Fable 5 costs $10.00 per 1M tokens for input and $50.00 per 1M tokens for output, as Anthropic lists it.
What is the knowledge cutoff of Claude Fable 5?
The knowledge cutoff of Claude Fable 5 is January 2026.
More from Anthropic
- Claude 1.0
- Claude 1.1
- Claude 1.2
- Claude 1.3
- Claude 2
- Claude 2.1
- Claude 3 Haiku
- Claude 3 Opus
- Claude 3 Sonnet
- Claude 3.5 Haiku
- Claude Fable 5.1
- Claude Haiku 4.5
- Claude Haiku 5.5
- Claude Instant 1.0
- Claude Instant 1.1
- Claude Instant 1.2
- Claude Mythos Preview
- Claude Opus 4.1
- Claude Opus 4.5
- Claude Opus 4.6
- Claude Opus 4.7
- Claude Opus 4.8
- Claude Opus 5
- Claude Opus 5.5
Sources
- Claude Fable 5 (read 16 October 2026)
- Anthropic’s Transparency Hub (read 16 October 2026)
- Model deprecations (read 16 October 2026)
- Model system cards (read 16 October 2026)
- Claude Fable 5 & Claude Mythos 5 System Card (read 16 October 2026)
- Claude Fable 5 and Claude Mythos 5 (read 16 October 2026)