Claude 4.5 Sonnet
Claude 4.5 Sonnet — Anthropic multimodal model with an Intelligence Index of 31, a 1M-token context window and a blended price of $1.2/1M tokens.
Key specifications
| Intelligence Index | 31 |
|---|---|
| Coding Index | 52.1 |
| Agentic Index | 24.6 |
| Arena Elo | — |
| Context window (K tokens) | 1,000 |
| Blended price ($/1M tokens) | 1.2 |
| Output speed (tokens/s) | 40 |
About Claude 4.5 Sonnet
The Claude 4.5 Sonnet is a multimodal model from Anthropic with an Intelligence Index of 31.0, a Coding Index of 52.1 and a 1 million-token context window. It runs at a blended price of $1.20 per million tokens and generates about 40 tokens/s. It is proprietary api. Leaderboard indices are a strong signal but only part of real-world quality, which also depends on tool use, latency and task fit.
The comparisons below show how Claude 4.5 Sonnet stacks up against the alternatives people most often weigh against it, with the specific numbers laid out side by side.
Frequently asked questions
Is the Claude 4.5 Sonnet any good?
Claude 4.5 Sonnet — Anthropic multimodal model with an Intelligence Index of 31, a 1M-token context window and a blended price of $1.2/1M tokens.
What are the key specs of the Claude 4.5 Sonnet?
See the specification table above for the full breakdown.