Gemini 3.8 Flash vs GPT-6 Astra
Gemini 3.8 Flash (Google DeepMind) and GPT-6 Astra (OpenAI) compared on benchmarks, pricing, context window, and use-case rankings.
- GPT-6 Astra leads on overall intelligence (ECI 169 vs 159).
- Gemini 3.8 Flash is cheaper on input tokens: $0.75 vs $10.00 per 1M.
- GPT-6 Astra has a larger context window (1.1M vs 1M tokens).
- GPT-6 Astra ranks higher for coding (92nd vs 79th percentile).
| Attribute | Gemini 3.8 Flash | GPT-6 Astra |
|---|---|---|
| Scores | ||
| Intelligence (ECI) | 159 | 169 |
| Coding | 79 | 92 |
| Math | 73 | 85 |
| Reasoning & Knowledge | 88 | 96 |
| Agentic & Tools | 81 | 83 |
| Specifications | ||
| Developer | Google DeepMind | OpenAI |
| Family | Gemini | GPT |
| Released | Sep 2, 2026 | Sep 3, 2026 |
| Parameters | — | — |
| Availability | API access | API access |
| Context window | 1M | 1.1M |
| Price — $/M input | $0.75 | $10.00 |
| Price — $/M output | $3.75 | $50.00 |
| Inputs | text, image, video, file, audio | file, image, text |
| Outputs | text | text |
| Benchmarks | ||
| AIME 2024/2025 | 99% | 100% |
| APEX | 64% | 65% |
| ARC-AGI | 99% | 99% |
| ARC-AGI-2 | 89% | 95% |
| GPQA Diamond | 95% | 96% |
| Humanity's Last Exam | 45% | 55% |
| SciCode | 57% | 56% |
| SimpleBench | 82% | 87% |
| SimpleQA Verified | 70% | 76% |
| WebDev Arena | 1568 | 1800 |
| WeirdML | 85% | 94% |
| GSO (code optimization) | — | 79% |
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 3.8 Flash better than GPT-6 Astra?
On Epoch AI's Capabilities Index, GPT-6 Astra scores higher (169) than Gemini 3.8 Flash (159). The right pick depends on your task, so compare their coding, math, and reasoning scores in the table above.
Which is cheaper, Gemini 3.8 Flash or GPT-6 Astra?
Gemini 3.8 Flash is cheaper on input tokens at $0.75 per million, versus $10.00 (representative OpenRouter pricing).
Which has a larger context window, Gemini 3.8 Flash or GPT-6 Astra?
GPT-6 Astra supports up to 1.1M tokens, compared with 1M for the other.
Which is better for coding, Gemini 3.8 Flash or GPT-6 Astra?
GPT-6 Astra ranks higher across coding benchmarks like WebDev Arena and SciCode: 92nd vs 79th 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.