Compare models
Put up to 4 models beside each other — token prices, context windows, capabilities and provider, from the same catalogue the model pages read.
| Attribute | Claude Sonnet 5.5claude-sonnet-5.5 | S2.1 Pros2.1-pro | Perceptron Mk1.5perceptron-mk1.5 |
|---|---|---|---|
| Pricing | |||
| Input | $2.00 / 1M | $0 / 1M | $0.15 / 1M |
| Output | $10.00 / 1M | $0 / 1M | $1.50 / 1M |
| Cache Write (5m) | $2.50 / 1M | Not applicable | $0.15 / 1M |
| Cache Write (1h) | $4.00 / 1M | Not applicable | $0.15 / 1M |
| Cache Read | $0.20 / 1M | Not applicable | $0.15 / 1M |
| Web Search | $0 / 1M | $0 / 1M | $0 / 1M |
| Context | |||
| Max context | 1M | N/A | 36.9K |
| Max output | N/A | N/A | N/A |
| Capabilities | |||
| Vision | Yes | No | No |
| Function Calling | Yes | No | No |
| JSON Mode | Yes | No | No |
| Streaming | Yes | No | Yes |
| Catalogue | |||
| Provider | Anthropic | Fish Audio | Perceptron |
| Category | chat | voice | chat |
| Charge type | Pay As You Go | Pay As You Go | Pay As You Go |
| Released | — | 2026-07-29 | 2026-09-25 |
| Description | |||
| Summary | Claude Sonnet 5.5 is Anthropic's Sonnet-class model for well-scoped everyday work, serving as a direct upgrade to Sonnet 5. It excels at feature development, bug fixing, and creating polished documents, presentations, and spreadsheets, while offering clearer writing and communication than its predecessor. | Fish Audio S2.1 Pro text-to-speech. Billed per UTF-8 byte of input text. | Perceptron Mk1.5 chat model that accepts audio input. Audio and text input are billed per token. |