Gemini 3.7 Flash vs Claude Sonnet 5.5
Gemini 3.7 Flash was superseded by Gemini 3.8 Flash. 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 5.5 leads overall, C- to D+. Claude Sonnet 5.5 is about 7.9x cheaper per task. By suite, real-world issues is even at C- and Claude Sonnet 5.5 takes spec planning (C+ to D-). Take Gemini 3.7 Flash anyway when you want the side that is ahead on vibe coding.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 5.5 vs Gemini 3.7 Flash
Claude Sonnet 5.5 leads overall, C- to D+. By suite: real-world issues is even at C- (60% vs 60% capability); Claude Sonnet 5.5 takes spec planning, C+ to D- (74% vs 40% capability); Gemini 3.7 Flash takes vibe coding, C- to D+ (61% vs 48% capability). Gemini 3.7 Flash used 9.4% of Google AI Pro's weekly limit per pass, $0.023 per task at the listed price. Claude Sonnet 5.5 used <1% of Claude Max 5x's weekly limit per pass, $0.003 per task at the listed price. Per task, Claude Sonnet 5.5 is about 7.9x cheaper ($0.003 vs $0.023). Claude Sonnet 5.5 is faster on real-world issues: a median task takes 37s against 2m 38s. Both finished every task on it. Reasons to pick Gemini 3.7 Flash anyway: it leads on vibe coding (C- to D+).
Changed since W35: Gemini 3.7 Flash: real-world issues usage 8.5% to 8.2% of the weekly limit, spec planning D to D-, spec planning usage 1.3% to 1.2% of the weekly limit.
| Dimension | Gemini 3.7 Flash | Claude Sonnet 5.5 | Advantage |
|---|---|---|---|
| Capability | 60% | 60% | Even |
| Median task time | 2m 38s | 37s | 2m 1s faster (Claude Sonnet 5.5 leads) |
| Approx. task cost | $0.025 / task | $0.002 / task | $0.023 / task lower (Claude Sonnet 5.5 leads) |
Gemini 3.7 Flash: 8.2% of Google AI Pro (49.1% / 5h, 8.2% / 1w) per run. Its weekly limit holds 6 of the week's 33.6 5h windows. Claude Sonnet 5.5: 4.0% of Claude Max 5x (4.0% / 5h) 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 3.7 Flash | Claude Sonnet 5.5 | Advantage |
|---|---|---|---|
| Capability | 40% | 74% | +35% (Claude Sonnet 5.5 leads) |
| Median task time | 1m 38s | 3m 25s | 1m 47s faster (Gemini 3.7 Flash leads) |
| Approx. task cost | $0.014 / task | $0.007 / task | $0.007 / task lower (Claude Sonnet 5.5 leads) |
Gemini 3.7 Flash: 1.2% of Google AI Pro (7.1% / 5h, 1.2% / 1w) per run. Its weekly limit holds 6 of the week's 33.6 5h windows. Claude Sonnet 5.5: 4.0% of Claude Max 5x (4.0% / 5h) 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 3.7 Flash | Claude Sonnet 5.5 | Advantage |
|---|---|---|---|
| Capability | 61% | 48% | +13% (Gemini 3.7 Flash leads) |
| Median task time | 3m 37s | 56s | 2m 41s faster (Claude Sonnet 5.5 leads) |
| Approx. task cost | $0.028 / task | $0.001 / task | $0.027 / task lower (Claude Sonnet 5.5 leads) |
Gemini 3.7 Flash: 0.6% of Google AI Pro (3.6% / 5h, 0.6% / 1w) per good solve. Its weekly limit holds 6 of the week's 33.6 5h windows. Claude Sonnet 5.5: 0.2% of Claude Max 5x (0.2% / 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 3.7 Flash or Claude Sonnet 5.5?
They are even on our ladder: both clear tier 4 of 5 at 60% capability on real-world@v3, our private suite of real-world coding problems. Latest measurement 2026-08-30.
Which is cheaper per task, Gemini 3.7 Flash or Claude Sonnet 5.5?
Gemini 3.7 Flash used 9.4% of Google AI Pro's weekly limit per pass, $0.023 per task at the listed price. Claude Sonnet 5.5 used <1% of Claude Max 5x's weekly limit per pass, $0.003 per task at the listed price. Per task, Claude Sonnet 5.5 is about 7.9x cheaper ($0.003 vs $0.023).