Anthropic releases Claude Opus 5.5 at $4 / $20
The first Claude 5.5 model. Anthropic says it performs at Fable 5.1 level on most work and costs 40% less to run than Opus 5; a newsletter says user metrics suggest costs closer to Opus 5.
Why it matters: A newsletter chart showed it leading the Intelligence Index before Gemini 4 Carbon arrived.
- Price
- $4 / $20 per 1M tokens; fast mode $8 / $40
- Context
- 1M (Artificial Analysis; not stated on Anthropic's post)
- Availability
- All major clouds and API
- Parameters
- Not disclosed
| Benchmark | Score | Type | Measured or published by |
|---|---|---|---|
| AA Intelligence Index (max) | 59 | Independent | Artificial Analysis leaderboard |
| GDPval-AA v2.1 | 1846 Elo | Cited | Anthropic, citing Artificial Analysis |
| Terminal-Bench 4.0 | 66.4% (±2.6) | Self-reported | Anthropic |
| FrontierCode v1.1 (Main) | 54.4% | Self-reported | Anthropic |
| Humanity's Last Exam (tools) | 67.7% | Self-reported | Anthropic |