Anthropic · Flagship
Claude Fable 5.1
Anthropic positions it for demanding reasoning and long-horizon agentic work
- Provider
- Anthropic
- Family
- Claude
- Model type
- Flagship
- Official release date
- Sep 1, 2026
- Release type
- New version
- Status
- Generally available
- Previous version
- Claude Fable 5
- Input
- text, image
- Output
- text
- Context window
- 1,000,000 tokens
- Max output
- 128,000 tokens
- API model id
claude-fable-5-1- API price (input)
- $10 per 1M tokens
- API price (output)
- $50 per 1M tokens
- Price notes
- Cache hits $0.25/1M; Batch 50% off.
- Consumer apps
- —
- Developer API
- Claude API, Amazon Bedrock, Google Cloud, Microsoft Foundry, Claude Platform on AWS
- Free access
- None documented
- Paid access
- —
- Availability
- —
- Licence
- proprietary
Main improvements
- Anthropic positions it for demanding reasoning and long-horizon agentic work
- Cache reads priced at 2.5% of input (vs 10% on Fable 5)
- Same underlying model as Claude Mythos 5.1, which has limited availability
Best use cases
- Long-horizon agents
- Hard reasoning tasks
Benchmarks
No benchmark results recorded. We only list scores with a source, benchmark version and date.
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- Claude Opus 5.5 Generally available · Sep 22, 2026
- Claude Mythos 5.1 Generally available · Sep 1, 2026