token.app › Compare › GPT-5.1 vs Kimi K3
GPT-5.1 vs Kimi K3
Kimi K3 leads on 2 of 3 shared benchmarks. GPT-5.1 is 1.7× cheaper per token on a blended 3:1 basis. Kimi K3 accepts the larger context window (1.0M).
Head to head
Blended price uses a 3:1 input:output mix
| GPT-5.1 | Kimi K3 | |
|---|---|---|
| Provider | OpenAI | Moonshot AI |
| Input $/1M | $1.25 | $3.00 |
| Output $/1M | $10.00 | $15.00 |
| Blended $/1M | $3.44 | $6.00 |
| Context window | 400K | 1.0M |
| Max output | 128K | — |
| Released | Nov 2025 | Jul 2026 |
| Licence | Proprietary | Open weights |
| GPQA Diamond | 87.6% | 93.1% |
| SimpleQA Verified | 48.9% | 42.7% |
| OTIS Mock AIME | 88.6% | 97.2% |
Benchmark scores independently run and published by Epoch AI, 'AI Benchmarking Hub', used under CC BY 4.0. Only benchmarks with a score for BOTH models are compared.
Choose GPT-5.1 if…
- Costs less per token — $3.44 vs $6.00 blended
- Higher SimpleQA Verified (48.9% vs 42.7%)
Choose Kimi K3 if…
- Higher GPQA Diamond (93.1% vs 87.6%)
- Higher OTIS Mock AIME (97.2% vs 88.6%)
- Larger context window (1.0M)
- Open weights — self-hostable
- Newer model (released Jul 2026)
FAQ
Which is better, GPT-5.1 or Kimi K3?
Across the 3 benchmarks both models have independently-run scores for, GPT-5.1 leads on 1 and Kimi K3 leads on 2. Benchmarks are one input — price and context window are on this page too.
Is GPT-5.1 cheaper than Kimi K3?
GPT-5.1 is cheaper: $3.44 versus $6.00 per million tokens blended at 3:1 input:output. Input alone: $1.25 vs $3.00. Output alone: $10.00 vs $15.00.
What context windows do GPT-5.1 and Kimi K3 have?
GPT-5.1: 400,000 tokens. Kimi K3: 1,048,576 tokens.
Who makes GPT-5.1 and Kimi K3?
GPT-5.1 is made by OpenAI. Kimi K3 is made by Moonshot AI.