GPT-5.4 vs Kimi K3
GPT-5.4 (OpenAI) and Kimi K3 (Moonshot) compared on benchmarks, pricing, context window, and use-case rankings.
- Kimi K3 leads on overall intelligence (ECI 158 vs 157).
- Kimi K3 is cheaper on input tokens — $2.10 vs $2.50 per 1M.
- GPT-5.4 has a larger context window (1.1M vs 1M tokens).
- Kimi K3 ranks higher for coding (97th vs 74th percentile).
| Attribute | GPT-5.4 | Kimi K3 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 157 | 158 |
| Coding | 74 | 97 |
| Math | 86 | 80 |
| Reasoning & Knowledge | 72 | 73 |
| Agentic & Tools | 68 | 80 |
| Specifications | ||
| Developer | OpenAI | Moonshot |
| Family | GPT | Kimi |
| Released | Mar 5, 2026 | Jul 16, 2026 |
| Parameters | — | 2.8T |
| Availability | API access | Open weights (non-commercial) |
| Context window | 1.1M | 1M |
| Price — $/M input | $2.50 | $2.10 |
| Price — $/M output | $15.00 | $10.95 |
| Inputs | text, image, file | text, image, video |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 98% | 97% |
| APEX | 36% | 39% |
| ARC-AGI | 94% | 95% |
| ARC-AGI-2 | 74% | 60% |
| FrontierMath | 48% | — |
| FrontierMath Tier 4 | 27% | — |
| GPQA Diamond | 93% | 93% |
| GSO (code optimization) | 31% | — |
| Humanity's Last Exam | 36% | 47% |
| METR task horizon | 5.7 h | — |
| SciCode | 57% | 60% |
| SimpleQA Verified | 45% | 51% |
| SWE-bench Verified | 77% | — |
| Terminal-Bench | 82% | — |
| WebDev Arena | 1463 | 1674 |
| WeirdML | 78% | 83% |
| τ²-bench | 87% | — |
| SimpleBench | — | 61% |
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-5.4 better than Kimi K3?
On Epoch AI's Capabilities Index, Kimi K3 scores higher (158) than GPT-5.4 (157). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is cheaper, GPT-5.4 or Kimi K3?
Kimi K3 is cheaper on input tokens at $2.10 per million, versus $2.50 (representative OpenRouter pricing).
Which has a larger context window, GPT-5.4 or Kimi K3?
GPT-5.4 supports up to 1.1M tokens, compared with 1M for the other.
Which is better for coding, GPT-5.4 or Kimi K3?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, Kimi K3 ranks higher — 97th vs 74th percentile among the models tracked on Model Beat.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.