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Claude Opus 4.8 vs Kimi K3
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| Attribute | Claude Opus 4.8 | Kimi K3 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 158 | 158 |
| Coding | 87 | 97 |
| Math | 87 | 80 |
| Reasoning & Knowledge | 76 | 73 |
| Agentic & Tools | 73 | 72 |
| Specifications | ||
| Developer | Anthropic | Moonshot |
| Family | Claude | Kimi |
| Released | May 28, 2026 | Jul 16, 2026 |
| Parameters | — | 2.8T |
| Availability | API access | Open weights (non-commercial) |
| Context window | 1M | 1M |
| Price — $/M input | $5.00 | $2.10 |
| Price — $/M output | $25.00 | $10.95 |
| Inputs | text, image, file | text, image, video |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 98% | 97% |
| APEX | 49% | 51% |
| ARC-AGI | 93% | 95% |
| ARC-AGI-2 | 72% | 60% |
| FrontierMath | 47% | — |
| FrontierMath Tier 4 | 31% | — |
| GPQA Diamond | 91% | 93% |
| GSO (code optimization) | 47% | — |
| Humanity's Last Exam | 49% | 47% |
| SciCode | 54% | 60% |
| SimpleBench | 65% | 61% |
| SimpleQA Verified | 53% | 51% |
| WebDev Arena | 1559 | 1674 |
| WeirdML | 83% | 83% |
| τ²-bench | 94% | — |
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.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.