Compare / head-to-head
GPT-5.6 Solvso3
GPT-5.6 Sol leads 4 of 4 shared benchmarks. o3 is 2.4x cheaper per token. GPT-5.6 Sol has the larger context window (1.1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
4 – 0
GPT-5.6 Sol leads
Cheaper per token
o3
2.4x cheaper, input + output
Larger context
GPT-5.6 Sol
1.1M tokens
Provider uptime (30d)
94.306%
OpenAI
GPT-5.6 Sol
OpenAI · released 2026-07-09
textvision
Quality
Benchmark matrix
4 shared · 3 only GPT-5.6 Sol · 3 only o3| Benchmark | GPT-5.6 Sol | o3 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 4 | ||||
| GPQA Diamond | 94.6% ↗ | 81.8% ↗epoch | +12.8 pt | GPT-5.6 Sol |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 89.1% ↗epoch | 33.3% ↗epoch | +55.8 pt | GPT-5.6 Sol |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 100% ↗epoch | 84.4% ↗epoch | +15.6 pt | GPT-5.6 Sol |
| SimpleQA Verified | 69.7% ↗epoch | 49.4% ↗epoch | +20.3 pt | GPT-5.6 Sol |
| Only GPT-5.6 Sol reports · 3 | ||||
| DeepSWE v1.1 | 72.7% ↗ | not reported | — | — |
| FrontierMath Tier 4 v2 (Epoch AI run) | 82.9% ↗epoch | not reported | — | — |
| SWE-Bench Pro | 64.6% ↗ | not reported | — | — |
| Only o3 reports · 3 | ||||
| SWE-bench Verified | not reported | 69.1% ↗ | — | — |
| AIME 2025 | not reported | 89.2% ↗matharena ⚠ | — | — |
| SWE-bench Verified (Epoch AI run) | not reported | 62.3% ↗epoch | — | — |
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-5.6 Sol minus o3 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-5.6 Sol | o3 | Edge |
|---|---|---|---|
| Context window | 1.1M tokens | 200K tokens | GPT-5.6 Sol |
| Max output | 128K tokens | 100K tokens | GPT-5.6 Sol |
| Input price / 1M | $4 ↗ | $2 ↗ | o3 |
| Output price / 1M | $20 ↗ | $8 ↗ | o3 |
| Cached input / 1M | $0.4 ↗ | $0.5 ↗ | GPT-5.6 Sol |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $24 | $10 | o3 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-07-09 | 2025-04-16 | — |
| Cited benchmark scores | 8 | 7 | — |
Reliability
OpenAI status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
GPT-5.6 Sol vs …
Models sharing the most benchmarksMore matchups
o3 vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run GPT-5.6 Sol and o3 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.