---
type: "Comparison"
title: "Claude Opus 4 (June) vs Claude Opus 4 (May): AI Model Comparison"
description: "Compare Claude Opus 4 June vs May 2025. Coding, reasoning, tool use benchmarks analyzed."
resource: "https://www.contextstudios.ai/comparisons/claude-opus-4-6-vs-claude-opus-4-5"
language: "en"
tags: ["claude opus 4 comparison", "claude opus june vs may", "anthropic opus 4 update"]
generated:
  by: "process:contextstudios-md/1"
  at: "2026-10-08T20:59:04.920Z"
status: "stable"
---

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

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

## Detailed Comparison

| Factor | Claude Opus 4 (June 2025) | Claude Opus 4 (May 2025) | Winner |
|--------|------|------|--------|
| Coding Performance | Improved SWE-bench scores, better multi-step code generation | Strong baseline coding capabilities | Claude Opus 4 (June 2025) |
| Reasoning & Analysis | Slightly better extended thinking consistency | Already excellent reasoning | Tie |
| Tool Use & Function Calling | More reliable schema adherence, fewer hallucinated parameters | Good tool use with occasional schema drift | Claude Opus 4 (June 2025) |
| Instruction Following | More precise system prompt adherence in long conversations | Solid instruction following with some drift | Claude Opus 4 (June 2025) |
| Pricing & Availability | $15/MTok input, $75/MTok output | $15/MTok input, $75/MTok output | Tie |

## Key Statistics

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

## 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.

## Our Recommendation

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