Compare / head-to-head
GPT-5 nanovsGPT-6 Astra
GPT-6 Astra leads 5 of 5 shared benchmarks. GPT-5 nano is 133.3x 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
GPT-5 nano
133.3x cheaper, input + output
Larger context
GPT-6 Astra
1.1M tokens
Provider uptime (30d)
94.2652%
OpenAI
GPT-5 nano
OpenAI · released 2025-08-07
textvision
GPT-6 Astra
OpenAI · released 2026-09-03
textvision
Quality
Benchmark matrix
5 shared · 2 only GPT-5 nano · 2 only GPT-6 Astra| Benchmark | GPT-5 nano | GPT-6 Astra | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 69.4% ↗epoch | 96% ↗ | -26.6 pt | GPT-6 Astra |
| FrontierMath Tier 4 v2 (Epoch AI run) | 2.4% ↗epoch | 97.6% ↗epoch | -95.2 pt | GPT-6 Astra |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 20% ↗epoch | 93.7% ↗epoch | -73.7 pt | GPT-6 Astra |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 81.1% ↗epoch | 100% ↗epoch | -18.9 pt | GPT-6 Astra |
| SimpleQA Verified | 11.7% ↗epoch | 75.6% ↗epoch | -63.9 pt | GPT-6 Astra |
| Only GPT-5 nano reports · 2 | ||||
| SWE-bench Verified | 54.7% ↗ | not reported | — | — |
| AIME 2025 | 85% ↗matharena ⚠ | 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 GPT-5 nano 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 | GPT-5 nano | GPT-6 Astra | Edge |
|---|---|---|---|
| Context window | 400K tokens | 1.1M tokens | GPT-6 Astra |
| Max output | 128K tokens | 128K tokens | Tie |
| Input price / 1M | $0.05 ↗ | $10 ↗ | GPT-5 nano |
| Output price / 1M | $0.4 ↗ | $50 ↗ | GPT-5 nano |
| Cached input / 1M | $0.005 ↗ | $1 ↗ | GPT-5 nano |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $0.45 | $60 | GPT-5 nano |
| Modalities | text · vision | text · vision | Tie |
| Released | 2025-08-07 | 2026-09-03 | — |
| Cited benchmark scores | 7 | 8 | — |
Reliability
OpenAI status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
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GPT-6 Astra vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run GPT-5 nano and GPT-6 Astra on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.