Compare / head-to-head
GPT-6 Astravs
Gemini 3.8 Flash
GPT-6 Astra leads 24 of 27 shared benchmarks. Gemini 3.8 Flash is 13.3x cheaper per token. GPT-6 Astra has the larger context window (1.1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
24 – 3
GPT-6 Astra leads
Cheaper per token
Gemini 3.8 Flash
13.3x cheaper, input + output
Larger context
GPT-6 Astra
1.1M tokens
Providers
2 providers
OpenAI · Google
GPT-6 Astra
OpenAI · released 2026-09-03
textvision
Gemini 3.8 Flash
Google · released 2026-09-02
textvisionaudio
Quality
Benchmark matrix
27 shared · 6 only GPT-6 Astra · 10 only Gemini 3.8 Flash| Benchmark | GPT-6 Astra | Gemini 3.8 Flash | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 27 | ||||
| GPQA Diamond | 96% ↗ | 95.3% ↗ | +0.7 pt | GPT-6 Astra |
| LMArena Elo | 1477.1 ↗ | 1494.8 ↗ | -17.7 | Gemini 3.8 Flash |
| APEX-Agents (Mercor) | 64.7% ↗ | 64.3% ↗ | +0.4 pt | GPT-6 Astra |
| Chess Puzzles (Epoch AI run) | 72% ↗epoch run | 61% ↗epoch run | +11 pt | GPT-6 Astra |
| DeepSWE v1.1 (Datacurve) | 74.1% ↗ | 73.8% ↗ | +0.3 pt | GPT-6 Astra |
| FrontierMath Tier 4 v2 (Epoch AI run) | 97.6% ↗epoch run | 22% ↗epoch run | +75.6 pt | GPT-6 Astra |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 93.7% ↗epoch run | 68.4% ↗epoch run | +25.3 pt | GPT-6 Astra |
| FrontierSWE V2 (Proximal Labs) | 65.5% ↗ | 19.6% ↗ | +45.9 pt | GPT-6 Astra |
| Furniture Assembly (Epoch AI run) | 80% ↗epoch run | 31.7% ↗epoch run | +48.3 pt | GPT-6 Astra |
| LiveBench Agentic Coding (LiveBench) | 57.3% ↗ | 54.2% ↗ | +3.1 pt | GPT-6 Astra |
| LiveBench Coding (LiveBench) | 80.4% ↗ | 72.5% ↗ | +7.9 pt | GPT-6 Astra |
| LiveBench Data Analysis (LiveBench) | 83% ↗ | 54% ↗ | +29 pt | GPT-6 Astra |
| LiveBench Instruction Following (LiveBench) | 75.6% ↗ | 81.4% ↗ | -5.8 pt | Gemini 3.8 Flash |
| LiveBench Language (LiveBench) | 89.4% ↗ | 87.8% ↗ | +1.6 pt | GPT-6 Astra |
| LiveBench Mathematics (LiveBench) | 96.8% ↗ | 91.6% ↗ | +5.2 pt | GPT-6 Astra |
| LiveBench Reasoning (LiveBench) | 92.7% ↗ | 89.3% ↗ | +3.4 pt | GPT-6 Astra |
| LMArena Agent (LMArena) | 0.1227 ↗ | 0.0297 ↗ | +0.1 | GPT-6 Astra |
| LMArena Vision (LMArena) | 1284.3 ↗ | 1290.3 ↗ | -6 | Gemini 3.8 Flash |
| LMArena WebDev (LMArena) | 1787.7 ↗ | 1582.7 ↗ | +205 | GPT-6 Astra |
| Mystery Game Puzzles (Epoch AI run) | 84% ↗epoch run | 47% ↗epoch run | +37 pt | GPT-6 Astra |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 100% ↗epoch run | 98.9% ↗epoch run | +1.1 pt | GPT-6 Astra |
| SAGE (Vals AI) | 46.4% ↗ | 35.1% ↗ | +11.3 pt | GPT-6 Astra |
| SimpleBench (SimpleBench) | 86.5% ↗ | 82.4% ↗ | +4.1 pt | GPT-6 Astra |
| SimpleQA Verified | 75.6% ↗epoch run | 69.7% ↗epoch run | +5.9 pt | GPT-6 Astra |
| Terminal-Bench 4.0 (Vals AI) | 59.6% ↗ | 19.2% ↗ | +40.4 pt | GPT-6 Astra |
| Vending-Bench 2 (Andon Labs) | 15514.7 ↗ | 5093.79 ↗ | +10420.9 | GPT-6 Astra |
| WeirdML (Håvard Tveit Ihle) | 93.6% ↗ | 84.8% ↗ | +8.8 pt | GPT-6 Astra |
| Only GPT-6 Astra reports · 6 | ||||
| AutomationBench 1.0.6 | 41.4% ↗ | not reported | — | — |
| BALROG (BALROG) | 68.3% ↗ | not reported | — | — |
| EBR-bench (Epoch AI run) | 76.2% ↗epoch run | not reported | — | — |
| GSO Opt@1 (GSO) | 77.5% ↗ | not reported | — | — |
| MirrorCode (Epoch AI run) | 46.7% ↗epoch run | not reported | — | — |
| Terminal-Bench Science 0.1 | 64.6% ↗ | not reported | — | — |
| Only Gemini 3.8 Flash reports · 10 | ||||
| CharXiv Reasoning (no tools) | not reported | 86.2% ↗ | — | — |
| DeepSWE v1.1 | not reported | 73.7% ↗ | — | — |
| GDPVal-AA v2 | not reported | 1545 ↗ | — | — |
| Harvey's Legal Agent Benchmark | not reported | 10% ↗ | — | — |
| HLE-Verified | not reported | 54.9% ↗ | — | — |
| LABBench2 | not reported | 86.2% ↗ | — | — |
| OSWorld-2.0 | not reported | 59% ↗ | — | — |
| Terminal-bench 2.1 | not reported | 89.4% ↗ | — | — |
| Terminal-bench 4.0 | not reported | 19.1% ↗ | — | — |
| Vals Finance Agent v2 | not reported | 61.4% ↗ | — | — |
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is GPT-6 Astra minus Gemini 3.8 Flash in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | GPT-6 Astra | Gemini 3.8 Flash | Edge |
|---|---|---|---|
| Context window | 1.1M tokens | 1.0M tokens | GPT-6 Astra |
| Max output | 128K tokens | 66K tokens | GPT-6 Astra |
| Input price / 1M | $10 ↗ | $0.75 ↗ | Gemini 3.8 Flash |
| Output price / 1M | $50 ↗ | $3.75 ↗ | Gemini 3.8 Flash |
| Cached input / 1M | $1 ↗ | $0.075 ↗ | Gemini 3.8 Flash |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $60 | $4.5 | Gemini 3.8 Flash |
| Modalities | text · vision | text · vision · audio | Gemini 3.8 Flash |
| Released | 2026-09-03 | 2026-09-02 | — |
| Cited benchmark scores | 39 | 43 | — |
Reliability
Provider status
Live from /statusMore matchups
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Gemini 3.8 Flash vs …
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Which one wins on your data?
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