Gemini 3.1 Pro vs Claude Opus 5.5
Claude Opus 5.5 leads overall, B- to F. Claude Opus 5.5 is about 1.6x cheaper per task. By suite, Claude Opus 5.5 takes real-world issues (C+ to D+) and spec planning (C+ to F). The data gives no reason to pick Gemini 3.1 Pro over Claude Opus 5.5 this week.Measured
Each agent graded on the same private suites, running headless through its own tools. Advantages are oriented so a win is a win, whichever way the metric runs.
Verdict: Claude Opus 5.5 vs Gemini 3.1 Pro
Claude Opus 5.5 leads overall, B- to F. By suite: Claude Opus 5.5 takes real-world issues, C+ to D+ (73% vs 53% capability); Claude Opus 5.5 takes spec planning, C+ to F (73% vs 21% capability); Claude Opus 5.5 takes vibe coding, B+ to F (90% vs 27% capability). Gemini 3.1 Pro used 15.9% of Google AI Pro's weekly limit per pass, $0.038 per task at the listed price. Claude Opus 5.5 used 2% of Claude Max 5x's weekly limit per pass, $0.024 per task at the listed price. Per task, Claude Opus 5.5 is about 1.6x cheaper ($0.024 vs $0.038). Claude Opus 5.5 is faster on real-world issues: a median task takes 1m 17s against 4m 53s. Both finished every task on it. The data gives no reason to pick Gemini 3.1 Pro over Claude Opus 5.5 this week.
Changed since W39: Gemini 3.1 Pro: real-world issues usage 9.8% to 14.8% of the weekly limit, spec planning usage 0.9% to 1.1% of the weekly limit, vibe coding usage 1.0% to 0.7% of the weekly limit; Claude Opus 5.5: real-world issues C- to C+, vibe coding B to B+.
| Dimension | Gemini 3.1 Pro | Claude Opus 5.5 | Advantage |
|---|---|---|---|
| Capability | 53% | 73% | +20% (Claude Opus 5.5 leads) |
| Median task time | 4m 53s | 1m 17s | 3m 36s faster (Claude Opus 5.5 leads) |
| Approx. task cost | $0.045 / task | $0.015 / task | $0.030 / task lower (Claude Opus 5.5 leads) |
Gemini 3.1 Pro: 14.8% of Google AI Pro (88.9% / 5h, 14.8% / 1w) per run. Its weekly limit holds 6 of the week's 33.6 5h windows. Claude Opus 5.5: 11.0% of Claude Max 5x (11.0% / 5h, 1.0% / 1w) per run. Its weekly limit holds about 13.8 of the week's 33.6 5h windows. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | Gemini 3.1 Pro | Claude Opus 5.5 | Advantage |
|---|---|---|---|
| Capability | 21% | 73% | +52% (Claude Opus 5.5 leads) |
| Median task time | 1m 46s | 4m 17s | 2m 31s faster (Gemini 3.1 Pro leads) |
| Approx. task cost | $0.013 / task | $0.057 / task | $0.045 / task lower (Gemini 3.1 Pro leads) |
Gemini 3.1 Pro: 1.1% of Google AI Pro (6.5% / 5h, 1.1% / 1w) per run. Its weekly limit holds 6 of the week's 33.6 5h windows. Claude Opus 5.5: 6.0% of Claude Max 5x (6.0% / 5h, 1.0% / 1w) per run. Its weekly limit holds about 13.8 of the week's 33.6 5h windows. Each figure is a share of that agent's own plan, so there is no delta to draw.
| Dimension | Gemini 3.1 Pro | Claude Opus 5.5 | Advantage |
|---|---|---|---|
| Capability | 27% | 90% | +63% (Claude Opus 5.5 leads) |
| Median task time | 4m 38s | 2m 44s | 1m 53s faster (Claude Opus 5.5 leads) |
| Approx. task cost | $0.034 / task | $0.007 / task | $0.027 / task lower (Claude Opus 5.5 leads) |
Gemini 3.1 Pro: 0.7% of Google AI Pro (4.4% / 5h, 0.7% / 1w) per good solve. Its weekly limit holds 6 of the week's 33.6 5h windows. Claude Opus 5.5: 1.0% of Claude Max 5x (1.0% / 5h) per good solve. Its weekly limit holds about 13.8 of the week's 33.6 5h windows. Each figure is a share of that agent's own plan, so there is no delta to draw.
Grades and deltas are comparable only within a suite version. See methodology.
Frequently asked questions
Which is better for coding, Gemini 3.1 Pro or Claude Opus 5.5?
Claude Opus 5.5 clears higher: tier 4 of 5 versus tier 3 for Gemini 3.1 Pro on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-09-28.
Which is cheaper per task, Gemini 3.1 Pro or Claude Opus 5.5?
Gemini 3.1 Pro used 15.9% of Google AI Pro's weekly limit per pass, $0.038 per task at the listed price. Claude Opus 5.5 used 2% of Claude Max 5x's weekly limit per pass, $0.024 per task at the listed price. Per task, Claude Opus 5.5 is about 1.6x cheaper ($0.024 vs $0.038).