Claude Opus 5.5 (Medium, Default Fallback) vs Kimi K3.1 Pro
Which is better for the money: Claude Opus 5.5 (Medium, Default Fallback) by Anthropic or Kimi K3.1 Pro by Kimi? Intelligence, total benchmark cost, and end-to-end time from Artificial Analysis & other sources, snapshot 2026-10-24.
Trade-off
Verdict
Depends on your budget
Kimi K3.1 Pro scores 3.9 points higher (55.1 vs 51.2) but costs 1.9× as much to run the benchmark ($3117 vs $1627; flagship vs premium cost classes). Pick Kimi K3.1 Pro when the extra intelligence is worth the premium, otherwise Claude Opus 5.5 (Medium, Default Fallba….
| Metric | Claude Opus 5.5 (Medium, Default Fallback) | Kimi K3.1 Pro | Difference |
|---|---|---|---|
| Intelligence (higher is better) | 51.2 | 55.1 | +7.6% Kimi K3.1 Pro is 7.6% more intelligent |
| Total AA cost (lower is better) | $1,626.81 | $3,117.31 | +91.6% Kimi K3.1 Pro is 91.6% more expensive |
| End-to-end time (lower is better) | 20.28s | 42.64s | +110.3% Kimi K3.1 Pro is 110.3% slower |
| Price per 1M tokens (in / out) | $4.00 / $20.0 | $2.00 / $10.0 | |
| Input modalities | Text, Image | Text, Image |
Kimi K3.1 Pro vs Claude Opus 5.5 (Medium, Default Fallback): 7.6% more intelligence, 91.6% more cost to run the AA benchmark, and 110.3% slower end-to-end.
Today's Pareto frontier
Against the frontier
- Claude Opus 5.5 (Medium, Default Fallback) is off the frontier: at the same or lower cost, GPT-6.1 Sol (Max) scores 51.80 for $1082.
- Kimi K3.1 Pro is on today's frontier: nothing is both smarter and cheaper.
Claude Opus 5.5 (Medium, Default Fallback)Kimi K3.1 ProToday's Pareto frontierEvery other model
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