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Kimi K3.1 Pro beats Opus 5.5 on several benchmarks at lower price
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A post reports that Kimi K3.1 Pro outperforms Opus 5.5 on several benchmarks, including SWE Marathon (51.7 vs 46.3), OfficeQA Pro (64.4 vs 62.2), Humanity's Last Exam (70.0 vs 67.7), GDP.pdf (34.6 vs 30.6), and ZeroBench (63 vs 61). The post states Opus 5.5 remains better overall but calls Kimi K3.1 Pro a good update, adding that it also competes with GPT-6 Astra on several benchmarks, beating it on some while Astra leads on Terminal-Bench Science and Kimi Code Bench Long-horizon. Pricing is highlighted: Kimi K3.1 Pro at $2/M input and $10/M output, versus Kimi K3 at $3/$15, Opus 5.5 at $4/$20, Sonnet 5.5 and GPT-6.1 Sol at $2/$10, and GPT-6 Astra at $10/$50. The post says Kimi K3.1 Pro has 2.8T total parameters and a 1M-token context window, calling it one of the strongest open-weight models available.
Source report
Kimi K3.1 Pro is looking competitive, beating Opus 5.5 on several benchmarks:
- SWE Marathon: 51.7 vs 46.3
- OfficeQA Pro: 64.4 vs 62.2
- Humanity's Last Exam: 70.0 vs 67.7
- GDP.pdf: 34.6 vs 30.6
- ZeroBench: 63 vs 61
Opus 5.5 is still better overall, but Kimi K3.1 Pro is a good update. It also competes with GPT-6 Astra on several benchmarks, beating it on some while Astra leads on Terminal-Bench Science and Kimi Code Bench Long-horizon.
Pricing
The pricing is more interesting:
- Kimi K3: $3/M input, $15/M output
- Kimi K3.1 Pro: $2/M input, $10/M output
That's 33% cheaper than K3, 50% cheaper than Opus 5.5 ($4/$20), the same price as Sonnet 5.5 and GPT-6.1 Sol ($2/$10), and 80% cheaper than GPT-6 Astra ($10/$50).
Specifications
With 2.8T total parameters and a 1M-token context window, Kimi K3.1 Pro is one of the strongest open-weight models out right now.
Source
pankajkumar_devNeutral / independent