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?

On SWE-Bench Verified (real-world software-engineering tasks), Claude Opus 4.5 leads — Claude Opus 4.5 scores 80.9% and Kimi K2 Thinking scores 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.

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Claude Opus 4.5 vs Kimi K2 Thinking

2 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
Science reasoning GPQA Diamond	87%	—
Software engineering SWE-Bench Verified	80.9%	71.3%
Multimodal understanding MMMU	—	—
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 2 of the tracked benchmarks (GPQA Diamond, SWE-Bench Verified, MMMU). 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 scores 80.9%, 9.6 points above 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?: On SWE-Bench Verified (real-world software-engineering tasks), Claude Opus 4.5 leads — Claude Opus 4.5 scores 80.9% and Kimi K2 Thinking scores 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.