Claude Sonnet 5.5
ModelActiveby Anthropic · family “claude-sonnet”
Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, succeeding Claude Sonnet 5 as a direct upgrade. It is especially strong at building features, fixing bugs, and producing... (description from the OpenRouter listing)
in: textin: imagein: fileout: textReasoningTool useStructured output
Epoch Capabilities Index
Not scored by Epoch AI
Released
28 Sep 2026
Context window
1M tokens
Max output
128K tokens
Input $ / 1M tokens
$2.00
Output $ / 1M tokens
$10.0
Cached input $ / 1M
$0.20
Each benchmark shown separately with its own source
Benchmark results (0)
No benchmark results recorded for this model.
Source: Epoch AI Benchmarking Hub (CC BY 4.0). “External” rows are leaderboard results Epoch collects from third parties. Best reported setting per benchmark is shown.
API list price over time
Price history
$ per 1M tokens
No data recorded for this period
1 observation (OpenRouter listing). History accumulates with every ingest run; a single point means no change has been observed yet.
Events
- Model launch21h agoAnthropic releases Claude Sonnet 5.5OpenRouter models API