---
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"
category: provider
language: en
timestamp: "2026-02-20T08:40:00.938Z"
---

# 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.

## Comparison Factors

| Factor | Claude Opus 4.6 | Previous Opus Models (e.g., 4.5) | Winner |
|--------|------|------|--------|
| Coding Performance | Improved SWE-bench scores, better multi-step code generation | Strong baseline coding capabilities | a |
| 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 | a |
| Instruction Following | More precise system prompt adherence in long conversations | Solid instruction following with some drift | a |
| 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
- 200K token context window (both)
- 96% vs 89% tool use success rate

## Choose Claude Opus 4.6 When

- You require improved coding workflows.
- Reliability in tool usage is essential.
- You are focused on agentic tasks.

## Choose Previous Opus Models (e.g., 4.5) When

- You are satisfied with current workflows.
- You have no urgent need for updates.
- Cost is a concern for upgrades.

## Verdict

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

Keywords: claude opus 4 comparison, claude opus june vs may, anthropic opus 4 update