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Anthropic

Claude Sonnet release timeline

2 versions across 2025 – 2026. Heights show the Artificial Analysis Intelligence Index for each release. The latest is Claude Sonnet 4.6.

RELEASE TIMELINE Claude Sonnet Anthropic · 2 versions · 2025 – 2026 34.74.5Sep 2025 47.24.6Feb 2026 INTELLIGENCE INDEX ↑ AI Model Radar aimodelradar.app · Performance: Artificial Analysis
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Vendors
Anthropic Google OpenAI
Model lines
Claude Opus Gemini Flash GPT-5 Gemini Pro Claude Sonnet GPT-4 OpenAI o-series

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