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September 20262

Sep 22, 2026Claude Opus 5.5 releasedAnthropic · Claude Opus 5.5 · 5.5

Anthropic released Claude Opus 5.5, the first model in the Claude 5.5 family, with higher capability and lower operating cost than Opus 5.

Anthropic Model releaseAnthropicClaude Opus 5.5
Sep 22, 2026GPT-6 Sol and GPT-6 Luna releasedOpenAI · GPT-6

OpenAI added GPT-6 Sol and GPT-6 Luna to the API as capability and efficiency tiers in the GPT-6 family.

OpenAI Developer Platform Model releaseOpenAIGPT-6
1–2 of 2 releases