Claude Opus 4.7 vs Kimi K2 for legal writing: which is better in 2026?
A head-to-head look at Claude Opus 4.7 and Kimi K2 for legal writing. Benchmarks via artificialanalysis.ai, pricing as of May 2026. Compare AI models like these inside Admix.
Quick verdict
For legal writing in May 2026, Kimi K2 edges out Claude Opus 4.7 on the contextWindow metric. Huge context window at low price.
Side-by-side specs
| Spec | Claude | Kimi |
|---|---|---|
| Intelligence index | 76.9 | 70.4 |
| Coding index | 82.3 | 68.9 |
| Context window | 1M tokens | 2M tokens |
| Speed (tok/s) | 88 | 110 |
| Input $/M | $15.00 | $0.60 |
| Output $/M | $75.00 | $2.50 |
| Released | Apr 23, 2026 | Dec 11, 2025 |
How they handle legal writing
Claude Opus 4.7: Most reliable tone and citation behavior for legal drafts.
Kimi K2: Huge context window at low price. The main caveat is coding lags western frontier models.
Cost per 1,000 queries
Assuming 1,500 input and 800 output tokens per query:
- Claude Opus 4.7: $82.50 per 1,000 queries
- Kimi K2: $2.90 per 1,000 queries
Verdict by sub-task
- Best raw quality on legal writing:
- Best price: Kimi K2
- Longest context: Kimi K2
- Fastest: Kimi K2
FAQ
Is Claude Opus 4.7 better than Kimi K2 for legal writing?
On May 2026 benchmarks (artificialanalysis.ai), Kimi K2 ranks higher than Claude Opus 4.7 for legal writing on the contextWindow metric. The gap is small enough that the choice often comes down to price, context length, and tone.
Which is cheaper, Claude Opus 4.7 or Kimi K2?
Claude Opus 4.7 costs $15.00 input and $75.00 output per million tokens. Kimi K2 costs $0.60 input and $2.50 output per million tokens.
Can I use both Claude and Kimi in one app?
Yes. Admix is a multi model AI chat aggregator that lets you run Claude Opus 4.7 and Kimi K2 side by side under one subscription.
Sources
Benchmarks from artificialanalysis.ai (May 2026).
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