Anthropic · Flagship
Claude Opus 5.5 Updated
Anthropic says it performs at the level of Fable 5.1 on most work
- Provider
- Anthropic
- Family
- Claude
- Model type
- Flagship
- Official release date
- Sep 22, 2026
- Release type
- New version
- Status
- Generally available
- Previous version
- Claude Opus 5
- Input
- text, image
- Output
- text
- Context window
- 1,000,000 tokens
- Max output
- 128,000 tokens
- API model id
claude-opus-5-5- API price (input)
- $4 per 1M tokens
- API price (output)
- $20 per 1M tokens
- Price notes
- Cache hits $0.20/1M; Fast mode $8/$40; 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 says it performs at the level of Fable 5.1 on most work
- Costs about 40% less to run than Opus 5 per Anthropic
- Recommended default model for most workloads
Best use cases
- Long-running agentic coding
- Knowledge work
Benchmarks
No benchmark results recorded. We only list scores with a source, benchmark version and date.
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- Claude Fable 5.1 Generally available · Sep 1, 2026
- Claude Mythos 5.1 Generally available · Sep 1, 2026