Claude Sonnet 4.5 20250929
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 improvements across system design, code security, and specification adherence. The model is designed for extended autonomous operation, maintaining task continuity across sessions and providing fact-based progress tracking. Sonnet 4.5 also introduces stronger agentic capabilities, including improved tool orchestration, speculative parallel execution, and more efficient context and memory management. With enhanced context tracking and awareness of token usage across tool calls, it is particularly well-suited for multi-context and long-running workflows. Use cases span software engineering, cybersecurity, financial analysis, research agents, and other domains requiring sustained reasoning and tool use.
- Input / output, from
- $3.00 / $15.00 per 1M
- Weekly tokens / requests
- 74.2M / 14.9K
- Context
- 200K tokens
- Released
- Sep 29, 2025
Paste into Claude Code, Cursor, or Codex
Help me set up the Respan gateway: fetch and follow https:/
Providers
3 routes from 2 providers, cheapest first, priced per 1M tokens after gateway discounts. BYOK routes use your own key.
| Provider | Input | Output |
|---|---|---|
Anthropic anthropic/claude-sonnet-4-5-20250929 | $3.00/M | $15.00/M |
BedrockBYOK only bedrock/global.anthropic.claude-sonnet-4-5-20250929-v1:0 | $3.00/M | $15.00/M |
BedrockBYOK only bedrock/us.anthropic.claude-sonnet-4-5-20250929-v1:0 | $3.30/M | $16.50/M |
Is a provider down? Anthropic status, AWS Bedrock status
Pricing
Averaged across 3 routes from 2 providers, in USD per 1M tokens after gateway discounts.
- Average input
- $3.10 per 1M
- Average output
- $15.50 per 1M
- Average cache read
- $0.31 per 1M
- Average cache write
- $3.88 per 1M
Cost by volume
Total cost from 0 to 1T tokens on the cheapest and most expensive provider.
Throughput and latency
30-day averages from requests through the Respan gateway. Under each figure, every model on the gateway by its average, this one in blue.
Output speed
Higher is better2936tokens/sbest, on Anthropic
- Anthropic2936 tok/s
- Bedrockus.anthropic.claude-sonnet-4-5-20250929-v1:025 tok/s
- Bedrockglobal.anthropic.claude-sonnet-4-5-20250929-v1:03.5 tok/s
Time to first token
Lower is better1.1son Anthropic
Response latency
Lower is better1.4sbest, on Bedrock (global.anthropic.claude-sonnet-4-5-20250929-v1:0)
- Bedrockglobal.anthropic.claude-sonnet-4-5-20250929-v1:01.4 s
- Bedrockus.anthropic.claude-sonnet-4-5-20250929-v1:03.2 s
- Anthropic14 s
Apps
Use Claude Sonnet 4.5 20250929 in the tools you already run. Each guide points the app at the Respan gateway.
Setup guides for more apps are in the integration docs.
Claude Sonnet 4.5 20250929 FAQ
Short answers, built from the data on this page.
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Built to meet the security and privacy standards that enterprise and healthcare teams require.
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Works with your entire stack
Use Respan with your favorite frameworks and tools.
