Compare / head-to-head
GPT-5.4vsGPT-6 Astra
GPT-6 Astra leads 5 of 5 shared benchmarks. GPT-5.4 is 3.4x cheaper per token. Both offer a 1.1M-token context window.
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-5.4
3.4x cheaper, input + output
Larger context
Tie
both 1.1M tokens
Provider uptime (30d)
94.2446%
OpenAI
GPT-5.4
OpenAI · released 2026-03-05
textvision
GPT-6 Astra
OpenAI · released 2026-09-03
textvision
Quality
Benchmark matrix
5 shared · 15 only GPT-5.4 · 2 only GPT-6 Astra| Benchmark | GPT-5.4 | GPT-6 Astra | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 92.8% ↗ | 96% ↗ | -3.2 pt | GPT-6 Astra |
| FrontierMath Tier 4 v2 (Epoch AI run) | 49% ↗epoch | 97.6% ↗epoch | -48.6 pt | GPT-6 Astra |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 78.6% ↗epoch | 93.7% ↗epoch | -15.1 pt | GPT-6 Astra |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 97.8% ↗epoch | 100% ↗epoch | -2.2 pt | GPT-6 Astra |
| SimpleQA Verified | 45.1% ↗epoch | 75.6% ↗epoch | -30.5 pt | GPT-6 Astra |
| Only GPT-5.4 reports · 15 | ||||
| AIME 2026 | 99.2% ↗matharena ⚠ | not reported | — | — |
| Humanity's Last Exam (no tools) | 39.8% ↗ | not reported | — | — |
| LMArena Elo | 1452.6 ↗ | not reported | — | — |
| BrowseComp | 82.7% ↗ | not reported | — | — |
| GDPval (wins or ties) | 83% ↗ | not reported | — | — |
| Humanity's Last Exam (with tools) | 52.1% ↗ | not reported | — | — |
| MCP Atlas | 67.2% ↗ | not reported | — | — |
| MMMU-Pro (no tools) | 81.2% ↗ | not reported | — | — |
| MMMU-Pro (with tools) | 82.1% ↗ | not reported | — | — |
| OSWorld-Verified | 75% ↗ | not reported | — | — |
| SWE-Bench Pro | 57.7% ↗ | not reported | — | — |
| SWE-bench Verified (Epoch AI run) | 76.9% ↗epoch | not reported | — | — |
| Tau2-bench Telecom | 98.9% ↗ | not reported | — | — |
| Terminal-Bench 2.0 | 75.1% ↗ | not reported | — | — |
| Toolathlon | 54.6% ↗ | 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-5.4 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-5.4 | GPT-6 Astra | Edge |
|---|---|---|---|
| Context window | 1.1M tokens | 1.1M tokens | Tie |
| Max output | 128K tokens | 128K tokens | Tie |
| Input price / 1M | $2.5 ↗ | $10 ↗ | GPT-5.4 |
| Output price / 1M | $15 ↗ | $50 ↗ | GPT-5.4 |
| Cached input / 1M | $0.25 ↗ | $1 ↗ | GPT-5.4 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $17.5 | $60 | GPT-5.4 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-03-05 | 2026-09-03 | — |
| Cited benchmark scores | 21 | 8 | — |
Reliability
OpenAI status
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Which one wins on your data?
Public benchmarks are a starting point. Run GPT-5.4 and GPT-6 Astra on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.