Gemini 3.5 Flash vs GPT-5.6 Sol
Gemini 3.5 Flash (Google) and GPT-5.6 Sol (OpenAI) compared on benchmarks, pricing, context window, and use-case rankings.
- GPT-5.6 Sol leads on overall intelligence (ECI 162 vs 155).
- Gemini 3.5 Flash is cheaper on input tokens — $1.50 vs $5.00 per 1M.
- GPT-5.6 Sol has a larger context window (1.1M vs 1M tokens).
- GPT-5.6 Sol ranks higher for coding (95th vs 84th percentile).
| Attribute | Gemini 3.5 Flash | GPT-5.6 Sol |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 155 | 162 |
| Coding | 84 | 95 |
| Math | 72 | 97 |
| Reasoning & Knowledge | 83 | 95 |
| Agentic & Tools | 92 | 67 |
| Specifications | ||
| Developer | OpenAI | |
| Family | Gemini | GPT |
| Released | May 19, 2026 | Jul 9, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 1M | 1.1M |
| Price — $/M input | $1.50 | $5.00 |
| Price — $/M output | $9.00 | $30.00 |
| Inputs | text, image, video, file, audio | file, image, text |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 96% | 100% |
| APEX | 50% | 40% |
| ARC-AGI | 93% | 98% |
| ARC-AGI-2 | 72% | 93% |
| FrontierMath | 39% | — |
| FrontierMath Tier 4 | 15% | — |
| GPQA Diamond | 93% | 93% |
| Humanity's Last Exam | 41% | 47% |
| SciCode | 53% | 56% |
| SimpleBench | 77% | 72% |
| SimpleQA Verified | 68% | 72% |
| SWE-bench Verified | 79% | — |
| WebDev Arena | 1506 | — |
| WeirdML | 63% | 89% |
| τ²-bench | 95% | 85% |
Use-case scores are 0–100 percentile composites across each area’s benchmarks, ranked against every model from the past year. Highlighted cells lead each row. Open a model for the full picture.
Frequently asked questions
Is Gemini 3.5 Flash better than GPT-5.6 Sol?
On Epoch AI's Capabilities Index, GPT-5.6 Sol scores higher (162) than Gemini 3.5 Flash (155). The right pick depends on your task — compare their coding, math, and reasoning scores in the table above.
Which is cheaper, Gemini 3.5 Flash or GPT-5.6 Sol?
Gemini 3.5 Flash is cheaper on input tokens at $1.50 per million, versus $5.00 (representative OpenRouter pricing).
Which has a larger context window, Gemini 3.5 Flash or GPT-5.6 Sol?
GPT-5.6 Sol supports up to 1.1M tokens, compared with 1M for the other.
Which is better for coding, Gemini 3.5 Flash or GPT-5.6 Sol?
Across coding benchmarks like SWE-bench Verified and Terminal-Bench, GPT-5.6 Sol ranks higher — 95th vs 84th percentile among the models tracked on Model Beat.
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Benchmarks & model data from Epoch AI (CC BY); pricing & specs from OpenRouter. ECI = Epoch Capabilities Index.