GPT-6 Astra vs Kimi K3
GPT-6 Astra (OpenAI) and Kimi K3 (Moonshot) compared on benchmarks, pricing, context window, and use-case rankings.
- GPT-6 Astra leads on overall intelligence (ECI 169 vs 158).
- Kimi K3 is cheaper on input tokens: $1.85 vs $10.00 per 1M.
- GPT-6 Astra has a larger context window (1.1M vs 1M tokens).
- Kimi K3 ranks higher for coding (94th vs 92nd percentile).
| Attribute | GPT-6 Astra | Kimi K3 |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 169 | 158 |
| Coding | 92 | 94 |
| Math | 87 | 64 |
| Reasoning & Knowledge | 98 | 67 |
| Agentic & Tools | 86 | 58 |
| Specifications | ||
| Developer | OpenAI | Moonshot |
| Family | GPT | Kimi |
| Released | Sep 3, 2026 | Jul 16, 2026 |
| Parameters | — | 2.8T |
| Availability | API access | Open weights (non-commercial) |
| Context window | 1.1M | 1M |
| Price — $/M input | $10.00 | $1.85 |
| Price — $/M output | $50.00 | $9.50 |
| Inputs | file, image, text | text, image, video |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 100% | 97% |
| APEX | 65% | 48% |
| ARC-AGI | 99% | 95% |
| ARC-AGI-2 | 95% | 60% |
| GPQA Diamond | 96% | 93% |
| GSO (code optimization) | 79% | — |
| Humanity's Last Exam | 55% | 47% |
| SciCode | 56% | 60% |
| SimpleQA Verified | 76% | 51% |
| WebDev Arena | 1800 | 1674 |
| WeirdML | 94% | 83% |
| 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-6 Astra better than Kimi K3?
On Epoch AI's Capabilities Index, GPT-6 Astra scores higher (169) than Kimi K3 (158). The right pick depends on your task, so compare their coding, math, and reasoning scores in the table above.
Which is cheaper, GPT-6 Astra or Kimi K3?
Kimi K3 is cheaper on input tokens at $1.85 per million, versus $10.00 (representative OpenRouter pricing).
Which has a larger context window, GPT-6 Astra or Kimi K3?
GPT-6 Astra supports up to 1.1M tokens, compared with 1M for the other.
Which is better for coding, GPT-6 Astra or Kimi K3?
Kimi K3 ranks higher across coding benchmarks like WebDev Arena and SciCode: 94th vs 92nd 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.