Anthropic's Claude 4 Sonnet with the ability to show its thinking process step by step.
Claude 4 Sonnet Thinking by anthropic is currently listed from a single provider. Its reference price is $3.00 per 1M input tokens and $15.00 per 1M output tokens.
Artificial Analysis rates it 18.9 on the Intelligence Index, with 37.6 for coding. Against its lowest blended price of $6.00 per 1M, that is roughly 3 index points per dollar, which is the value ratio the leaderboards rank on.
The context window is 1,000,000 tokens, with an output limit of 64,000 tokens. It supports reasoning, tool use, and structured output. Accepted input modalities are Text, Image, and PDF.
Quality is independently evaluated by Artificial Analysis. Speed/latency are model-level medians.
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| NanoGPT anthropic/claude-sonnet-4:thinking | Gateway | $3.00 | $15.00 | $0.30 | — | 1,000,000 | 64,000 |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
1 / 1 providers expose no reasoning control (reasoning_options: []).
Individual evaluations run by Artificial Analysis, on the same reasoning tier as the intelligence score above. Each benchmark has its own task set and harness, so rows are not comparable with one another. The Intelligence Index above draws on a different, newer set of evaluations.