Claude 2 was released by Anthropic on July 11, 2023, as a flagship model in the Claude Opus line.
Scores higher than Claude 1.3 on coding and math tests, reads up to 100K tokens per prompt, and opened as a public beta on claude.ai in the US and UK.
Compared with Claude 1.3 · comparison chosen by Anthropic
Writes correct Python code for 7 in 10 test problems
Codex HumanEval — short Python programming tasks
71.2%
▲ up from 56.0% for Claude 1.3 · +15.2 points
Solves almost 9 in 10 grade-school math problems
GSM8k — grade-school math word problems
88.0%
▲ up from 85.2% for Claude 1.3 · +2.8 points
Every Monday, only when something shipped: the AI models that came out, what each one changed, and which lines are due next.
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Claude Opus 5.5 is the current model in this line. The card shows how long it has been since the last release against the line's usual gap and its recent ones — the rhythm, not a date.
Latest: Claude Opus 5.5 · Sep 22, 2026
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