Claude Sonnet 4.5
Claude Sonnet 4.5 is Anthropic’s most advanced Sonnet model to date, optimized for real-world agents and coding workflows. It delivers state-of-the-art performance on coding benchmarks such as SWE-bench Verified, with...
Claude Sonnet 4.5 specs and pricing
- Provider: Anthropic
- Released: September 29, 2025
- Context window: 1M tokens
- Max output: 64K tokens
- Input: text, images, files
- Output: text
- Price: $3.00 input / $15 output per 1M tokens
- Reasoning: yes
- Tool calling: yes
FAQ
- How much does Claude Sonnet 4.5 cost? Claude Sonnet 4.5 costs $3.00 per million input tokens and $15 per million output tokens through OpenRouter. In todo.is a typical agent step costs about 10.5 credits ($1 = 100 credits).
- What is the context window of Claude Sonnet 4.5? Claude Sonnet 4.5 can read up to 1M tokens at once and write up to 64K tokens in one reply.
- Can I use Claude Sonnet 4.5 without coding? Yes. In todo.is you pick Claude Sonnet 4.5 as your agent's model and write to-dos in plain words, on the web, the Android app, WhatsApp or Telegram. No API key needed: credits are included, or you can bring your own key.
JavaScript is required to use the todo.is app.