Compare / head-to-head
Gemini 3.8 FlashvsGPT-6 Astra
GPT-6 Astra leads 5 of 5 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
0 – 5
GPT-6 Astra leads
Cheaper per token
Gemini 3.8 Flash
13.3x cheaper, input + output
Larger context
GPT-6 Astra
1.1M tokens
Provider uptime (30d)
100% · 95.4802%
Google · OpenAI
Gemini 3.8 Flash
Google · released 2026-09-02
textvisionaudio
GPT-6 Astra
OpenAI · released 2026-09-03
textvision
Quality
Benchmark matrix
5 shared · 10 only Gemini 3.8 Flash · 2 only GPT-6 Astra| Benchmark | Gemini 3.8 Flash | GPT-6 Astra | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 95.3% ↗ | 96% ↗ | -0.7 pt | GPT-6 Astra |
| FrontierMath Tier 4 v2 (Epoch AI run) | 22% ↗epoch | 97.6% ↗epoch | -75.6 pt | GPT-6 Astra |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 68.4% ↗epoch | 93.7% ↗epoch | -25.3 pt | GPT-6 Astra |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 98.9% ↗epoch | 100% ↗epoch | -1.1 pt | GPT-6 Astra |
| SimpleQA Verified | 69.7% ↗epoch | 75.6% ↗epoch | -5.9 pt | GPT-6 Astra |
| Only Gemini 3.8 Flash reports · 10 | ||||
| CharXiv Reasoning (no tools) | 86.2% ↗ | not reported | — | — |
| DeepSWE v1.1 | 73.7% ↗ | not reported | — | — |
| GDPVal-AA v2 | 1545 ↗ | not reported | — | — |
| Harvey's Legal Agent Benchmark | 10% ↗ | not reported | — | — |
| HLE-Verified | 54.9% ↗ | not reported | — | — |
| LABBench2 | 86.2% ↗ | not reported | — | — |
| OSWorld-2.0 | 59% ↗ | not reported | — | — |
| Terminal-bench 2.1 | 89.4% ↗ | not reported | — | — |
| Terminal-bench 4.0 | 19.1% ↗ | not reported | — | — |
| Vals Finance Agent v2 | 61.4% ↗ | not reported | — | — |
| Only GPT-6 Astra reports · 2 | ||||
| AutomationBench | not reported | 41.4% ↗ | — | — |
| Terminal-Bench Science 0.1 | not reported | 64.6% ↗ | — | — |
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 Gemini 3.8 Flash minus GPT-6 Astra 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 | Gemini 3.8 Flash | GPT-6 Astra | Edge |
|---|---|---|---|
| Context window | 1.0M tokens | 1.1M tokens | GPT-6 Astra |
| Max output | 66K tokens | 128K tokens | GPT-6 Astra |
| Input price / 1M | $0.75 ↗ | $10 ↗ | Gemini 3.8 Flash |
| Output price / 1M | $3.75 ↗ | $50 ↗ | Gemini 3.8 Flash |
| Cached input / 1M | $0.075 ↗ | $1 ↗ | Gemini 3.8 Flash |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $4.5 | $60 | Gemini 3.8 Flash |
| Modalities | text · vision · audio | text · vision | Gemini 3.8 Flash |
| Released | 2026-09-02 | 2026-09-03 | — |
| Cited benchmark scores | 16 | 8 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Gemini 3.8 Flash vs …
Models sharing the most benchmarksMore matchups
GPT-6 Astra vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Gemini 3.8 Flash and GPT-6 Astra on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.