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Claude Sonnet 4.5
by Anthropic · Language Models
Context 200K tokens
by Anthropic · Language Models
Claude Sonnet 4.5 is an Anthropic model released September 2025, positioned at launch as among the best in the world for real-world agents, coding and computer use. It was state-of-the-art on SWE-bench Verified and was observed maintaining focus for more than 30 hours on complex, multi-step tasks. It launched alongside the Claude Agent SDK, giving developers the building blocks behind Claude Code, at $3 per million input and $15 per million output tokens. Best for long-duration autonomous agents, coding, finance and cybersecurity workloads.
$3.885 in · $19.425 out / 1M
| Usage | Rate (USD) | Unit |
|---|---|---|
| Input tokens | $3.88 | per 1M tokens |
| Cached input (cache hit) | $0.39 | per 1M tokens |
| Output tokens | $19.43 | per 1M tokens |
TuneRouter live platform pricing · currency: USD · pre-deduction settled by actual usage
OpenAI-compatible · base URL https://api.tunerouter.com/v1/
curl https://api.tunerouter.com/v1/chat/completions \
-H "Authorization: Bearer $TUNEROUTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model": "claude-sonnet-4-5-20250929", "messages": [{"role": "user", "content": "Hello!"}]}'Model ID: claude-sonnet-4-5-20250929 · works with OpenAI SDKs — just point base_url at api.tunerouter.com