Anthropic
claude-sonnet-4-5-20250929
Balanced Claude model for coding, analysis, agent workflows, and cost control
Model facts
- Context window
- 2K tokens
- Maximum output
- 64K tokens
- Cheapest paid input
- $2.7 per 1M tokens
- Cheapest paid output
- $13.5 per 1M tokens
- Open weights
- no
- Providers
- 5
Capabilities and modalities
reasoning, tool calling, structured output, attachments, temperature control, text, image, pdf.
Observed price history
- 2026-08-24: $2.7 input / $13.5 output per 1M tokens
API providers
- Jiekou.AI — model id claude-sonnet-4-5-20250929; $2.7 input / $13.5 output per 1M tokens; provider documentation
- 302.AI — model id claude-sonnet-4-5-20250929; $3 input / $15 output per 1M tokens; provider documentation
- Helicone — model id claude-sonnet-4-5-20250929; $3 input / $15 output per 1M tokens; provider documentation
- Merge Gateway — model id anthropic/claude-sonnet-4-5-20250929; $3 input / $15 output per 1M tokens; provider documentation
- Arena — model id claude-sonnet-4-5-20250929; not published input / not published output per 1M tokens; provider documentation