Gemini 3.1 Pro vs Claude Sonnet 5
Claude Sonnet 5 is no longer on the leaderboard. The grades below are the last ones measured, so read them as history rather than as this week's board. See the current roster.
Claude Sonnet 5 leads overall, D to F. Claude Sonnet 5 is about 1.6x cheaper per task. By suite, real-world issues is even at D+ and Claude Sonnet 5 takes spec planning (D to F). The data gives no reason to pick Gemini 3.1 Pro over Claude Sonnet 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 Sonnet 5 vs Gemini 3.1 Pro
Claude Sonnet 5 leads overall, D to F. By suite: real-world issues is even at D+ (53% vs 53% capability); Claude Sonnet 5 takes spec planning, D to F (44% vs 21% capability); vibe coding is even at F (27% vs 31% 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 Sonnet 5 used 2% of Claude Max 5x's weekly limit per pass, $0.024 per task at the listed price. Per task, Claude Sonnet 5 is about 1.6x cheaper ($0.024 vs $0.038). Claude Sonnet 5 is faster on real-world issues: a median task takes 3m 35s against 4m 53s. Both finished every task on it. The data gives no reason to pick Gemini 3.1 Pro over Claude Sonnet 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 Sonnet 5: vibe coding D+ to F.
| Dimension | Gemini 3.1 Pro | Claude Sonnet 5 | Advantage |
|---|---|---|---|
| Capability | 53% | 53% | Even |
| Median task time | 4m 53s | 3m 35s | 1m 18s faster (Claude Sonnet 5 leads) |
| Approx. task cost | $0.045 / task | $0.015 / task | $0.030 / task lower (Claude Sonnet 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 Sonnet 5: 12.0% of Claude Max 5x (12.0% / 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 Sonnet 5 | Advantage |
|---|---|---|---|
| Capability | 21% | 44% | +23% (Claude Sonnet 5 leads) |
| Median task time | 1m 46s | 5m 12s | 3m 26s 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 Sonnet 5: 5.0% of Claude Max 5x (5.0% / 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 Sonnet 5 | Advantage |
|---|---|---|---|
| Capability | 27% | 31% | +4% (Claude Sonnet 5 leads) |
| Median task time | 4m 38s | 4m 31s | 7s faster (Claude Sonnet 5 leads) |
| Approx. task cost | $0.034 / task | $0.007 / task | $0.027 / task lower (Claude Sonnet 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 Sonnet 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 Sonnet 5?
They are even on our ladder: both clear tier 3 of 5 at 53% capability 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 Sonnet 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 Sonnet 5 used 2% of Claude Max 5x's weekly limit per pass, $0.024 per task at the listed price. Per task, Claude Sonnet 5 is about 1.6x cheaper ($0.024 vs $0.038).