GPT-5 mini vs Kimi K3
GPT-5 mini (OpenAI) and Kimi K3 (Moonshot) compared on benchmarks, pricing, context window, and use-case rankings.
- Kimi K3 leads on overall intelligence (ECI 158 vs 146).
- GPT-5 mini is cheaper on input tokens — $0.25 vs $2.10 per 1M.
- Kimi K3 has a larger context window (1M vs 400K tokens).
- Kimi K3 ranks higher for coding (97th vs 20th percentile).
| Attribute | GPT-5 mini | Kimi K3 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 146 | 158 |
| Coding | 20 | 97 |
| Math | 55 | 80 |
| Reasoning & Knowledge | 21 | 73 |
| Agentic & Tools | 21 | 80 |
| Specifications | ||
| Developer | OpenAI | Moonshot |
| Family | GPT | Kimi |
| Released | Aug 7, 2025 | Jul 16, 2026 |
| Parameters | — | 2.8T |
| Availability | API access | Open weights (non-commercial) |
| Context window | 400K | 1M |
| Price — $/M input | $0.25 | $2.10 |
| Price — $/M output | $2.00 | $10.95 |
| Inputs | text, image, file | text, image, video |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 87% | 97% |
| ARC-AGI | 54% | 95% |
| ARC-AGI-2 | 4% | 60% |
| FrontierMath | 27% | — |
| FrontierMath Tier 4 | 6% | — |
| GPQA Diamond | 75% | 93% |
| Humanity's Last Exam | 19% | 47% |
| LiveCodeBench | 69% | — |
| MATH Level 5 | 98% | — |
| MMLU-Pro | 83% | — |
| SciCode | 41% | 60% |
| SimpleQA Verified | 22% | 51% |
| SWE-bench Verified | 65% | — |
| Terminal-Bench | 35% | — |
| WeirdML | 53% | 83% |
| τ²-bench | 71% | — |
| APEX | — | 39% |
| SimpleBench | — | 61% |
| WebDev Arena | — | 1674 |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Is GPT-5 mini better than Kimi K3?
On Epoch AI's Capabilities Index, Kimi K3 scores higher (158) than GPT-5 mini (146). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is cheaper, GPT-5 mini or Kimi K3?
GPT-5 mini is cheaper on input tokens at $0.25 per million, versus $2.10 (representative OpenRouter pricing).
Which has a larger context window, GPT-5 mini or Kimi K3?
Kimi K3 supports up to 1M tokens, compared with 400K for the other.
Which is better for coding, GPT-5 mini or Kimi K3?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, Kimi K3 ranks higher — 97th vs 20th percentile among the models tracked on Model Beat.
Want a different match-up? Open the compare tool to add or swap models.
More comparisons
Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.