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Claude Sonnet 4.5 — and what?

Pricing per million tokens, context window, capabilities — pulled from each provider's public docs. All 1 are available via the same AIgateway OpenAI-compatible endpoint; flip the model string to switch.

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Claude Sonnet 4.5
anthropic/claude-sonnet-4.5
Provider
Anthropic
Family
Claude 4
Modality
text
Context window
200,000 tok
Max output
8,192 tok
Released
2026-05-22
License
Proprietary
Input price
$3.00 /1M
Output price
$15.00 /1M
Tools
yes
Streaming
yes
Vision
yes
JSON mode
yes
Reasoning
yes
Prompt caching
Batch API
Try it
Open in playground →
Claude Sonnet 4.5
anthropic/claude-sonnet-4.5
Full spec →

Claude Sonnet 4.5 is the best coding model to date, with significant improvements across the entire development lifecycle.

Strengths
  • General-purpose chat
  • Long context
  • Tool use
Use cases
ChatbotsContent generationAgentic workflows

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Claude Sonnet 4 vs Claude Sonnet 4.5
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Claude Sonnet 4.6 vs Claude Sonnet 4.5
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