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Compare performance benchmarks, coding intelligence, reasoning evaluations, context limits, and API economics between Claude Opus 4.8 (Anthropic) and Kimi K3.1 Pro (Moonshot AI).
| Metric / Capability | Claude Opus 4.8 | Kimi K3.1 Pro |
|---|---|---|
| Developer / Organization | Anthropic | Moonshot AI |
| Release Date | 2026-05-27 | 2026-10-23 |
| Deployment / Weights | Proprietary Cloud API | Proprietary Cloud API |
| Context Window | 1M tokens (1,000,000 tokens) | 1.0M tokens (1,048,576 tokens) |
| Input Pricing (/1M Tokens) | $5 | $2 |
| Output Pricing (/1M Tokens) | $25 | $10 |
| Benchmark / Domain | Claude Opus 4.8 | Kimi K3.1 Pro | Advantage |
|---|---|---|---|
Artificial Analysis Intelligence Index Composite index aggregating 10+ evaluations of general reasoning and knowledge. | 41.8% | 55.1% | Kimi K3.1 Pro (+32%) |
Artificial Analysis Coding Index Composite index of coding and software-engineering evaluations. | 74.3% | — | — |
Artificial Analysis Agentic Index Composite index of tool-use and long-horizon agentic tasks. | 41.9% | — | — |
SWE-bench Pro Harder, contamination-resistant successor to SWE-bench spanning multiple languages. | 69.2% | — | — |
Terminal-Bench 4.0 Sandboxed command-line tasks requiring shell and file-system operation. | 23.6% | 65.7% | Kimi K3.1 Pro (+178%) |
ARC-AGI-2 Novel visual grid puzzles requiring abstract rule induction. | 72.1% | — | — |
GPQA Diamond Graduate-level physics, chemistry, and biology questions written by domain experts. | 93.6% | 94.2% | Kimi K3.1 Pro (+1%) |
Humanity's Last Exam Expert-written questions across hundreds of disciplines designed to resist saturation. | 49.8% | 51.1% | Kimi K3.1 Pro (+3%) |
FrontierMath v2 (Tiers 1-3) Unpublished, research-level mathematics problems across Tiers 1-3. | 80.0% | — | — |
Design Arena ELO Human-preference ELO across UI, 3D, data-visualization, and game-dev generations. | 1310 | 1448 | Kimi K3.1 Pro (+11%) |
Kimi K3.1 Pro outperforms Claude Opus 4.8 across 5 evaluated benchmarks compared to 0 for Claude Opus 4.8, excelling in Artificial Analysis Intelligence Index, Terminal-Bench 4.0, GPQA Diamond.
Kimi K3.1 Pro has the larger context capacity of 1.0M tokens (1,048,576 tokens), compared to 1M tokens for Claude Opus 4.8.
Kimi K3.1 Pro is more economical. Input tokens cost $2/M tokens compared to $5/M tokens for Claude Opus 4.8.
Claude Opus 4.8 is a proprietary cloud API. Kimi K3.1 Pro is a proprietary cloud API.
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