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Claude Opus 4 (June) vs Claude Opus 4 (May): AI Model Comparison

Compare Claude Opus 4 June vs May 2025. Coding, reasoning, tool use benchmarks analyzed.

Reviewed by Michael Kerkhoff, as of

Definition
Anthropic released Claude Opus 4 in May 2025, then an improved June update with better tool use, instruction following, and agentic coding performance.
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Claude Opus 4 (June 2025)Claude Opus 4 (May 2025)

Detailed Comparison

A side-by-side analysis of key factors to help you make the right choice.

Claude Opus 4 (June 2025) vs Claude Opus 4 (May 2025)
FactorClaude Opus 4 (June 2025)Claude Opus 4 (May 2025)
Coding PerformanceImproved SWE-bench scores, better multi-step code generation WinnerStrong baseline coding capabilities
Reasoning & AnalysisSlightly better extended thinking consistencyAlready excellent reasoning
Tool Use & Function CallingMore reliable schema adherence, fewer hallucinated parameters WinnerGood tool use with occasional schema drift
Instruction FollowingMore precise system prompt adherence in long conversations WinnerSolid instruction following with some drift
Pricing & Availability$15/MTok input, $75/MTok output$15/MTok input, $75/MTok output
Total Score · 2 ties3 / 50 / 5

Key Statistics

Real data from verified industry sources to support your decision.

Anthropic documentation (2025)
200K token context window (both)
Anthropic evaluation (2025)
96% vs 89% tool use success rate
  • 72.5% vs 67.8% on SWE-bench Verified — Anthropic benchmarks (2025)

All statistics come from verified third-party sources. Source, year, and direct link are shown on each metric.

When to Choose Each Option

Clear guidance based on your specific situation and needs.

Our Recommendation

The June release improves tool use reliability and coding workflows. Recommended upgrade for agentic and coding-heavy use cases.

Choose Claude Opus 4 (June 2025) when...
  • You require improved coding workflows.
  • Reliability in tool usage is essential.
  • You are focused on agentic tasks.
Choose Claude Opus 4 (May 2025) when...
  • You are satisfied with current workflows.
  • You have no urgent need for updates.
  • Cost is a concern for upgrades.

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