When was Claude Opus 4.5 released?

Claude Opus 4.5 was released by Anthropic on Nov 24 2025.

When was Kimi K2 Thinking released?

Kimi K2 Thinking was released by Moonshot AI on Nov 6 2025.

Which is better at coding, Claude Opus 4.5 or Kimi K2 Thinking?

Claude Opus 4.5 leads on SWE-Bench Verified — Claude Opus 4.5 80.9% vs Kimi K2 Thinking 71.3%.

Is Claude Opus 4.5 or Kimi K2 Thinking open source?

Kimi K2 Thinking is an open-source / open-weight model released by Moonshot AI. Claude Opus 4.5 is a proprietary model released by Anthropic.

Home Latest Analytics Contact

Latest Release

Claude Opus 4.8

May 28 2026

Home/Compare/Claude Opus 4.5 vs Kimi K2 Thinking

Claude Opus 4.5 vs Kimi K2 Thinking

1 vs 0 benchmarks won

	Anthropic Claude Opus 4.5	Moonshot AI Kimi K2 Thinking
Overview
Company	Anthropic	Moonshot AI
Release date	Nov 24 2025	Nov 6 2025
Model type	—	—
Open source	No	Yes
Specifications
Parameters	—	1T
Context window	—	256k
Benchmarks
Coding SWE-Bench Verified	80.9%Best	71.3%
Science GPQA Diamond	87%	—
Timeline
Release gap	Kimi K2 Thinking shipped 18 days before Claude Opus 4.5

Which is better: Claude Opus 4.5 or Kimi K2 Thinking?

Claude Opus 4.5 leads Kimi K2 Thinking on 1 of the 1 benchmark they both report (SWE-Bench Verified). Kimi K2 Thinking shipped 18 days before Claude Opus 4.5, so benchmark comparisons should account for the intervening progress.

Kimi K2 Thinking is an open-source / open-weight model; Claude Opus 4.5 is proprietary.

On SWE-Bench Verified, Claude Opus 4.5 leads at 80.9% vs Kimi K2 Thinking at 71.3%.

Frequently asked questions

When was Claude Opus 4.5 released?: Claude Opus 4.5 was released by Anthropic on Nov 24 2025.
When was Kimi K2 Thinking released?: Kimi K2 Thinking was released by Moonshot AI on Nov 6 2025.
Which is better at coding, Claude Opus 4.5 or Kimi K2 Thinking?: Claude Opus 4.5 leads on SWE-Bench Verified — Claude Opus 4.5 80.9% vs Kimi K2 Thinking 71.3%.
Is Claude Opus 4.5 or Kimi K2 Thinking open source?: Kimi K2 Thinking is an open-source / open-weight model released by Moonshot AI. Claude Opus 4.5 is a proprietary model released by Anthropic.