Compare / head-to-head
Claude Opus 5.5vs
GPT-5.4
Claude Opus 5.5 leads 1 of 1 shared benchmark. GPT-5.4 is 1.4x cheaper per token. GPT-5.4 has the larger context window (1.1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
1 – 0
Claude Opus 5.5 leads
Cheaper per token
GPT-5.4
1.4x cheaper, input + output
Larger context
GPT-5.4
1.1M tokens
Providers
2 providers
Anthropic · OpenAI
Claude Opus 5.5
Anthropic · released 2026-09-22
textvision
Quality
Benchmark matrix
1 shared · 8 only Claude Opus 5.5 · 19 only GPT-5.4| Benchmark | Claude Opus 5.5 | GPT-5.4 | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 1 | ||||
| Humanity's Last Exam (with tools) | 67.7% ↗ | 52.1% ↗ | +15.6 pt | Claude Opus 5.5 |
| Only Claude Opus 5.5 reports · 8 | ||||
| AutomationBench 1.0.6 | 40% ↗ | not reported | — | — |
| Chartography (with tools) | 89% ↗ | not reported | — | — |
| CursorBench 4.0 | 57.8% ↗ | not reported | — | — |
| FrontierCode v1.1 (Main) | 54.4% ↗ | not reported | — | — |
| GDPval-AA v2.1 | 1846 ↗ | not reported | — | — |
| OSWorld 2.0 (partial) | 81.8% ↗ | not reported | — | — |
| Terminal-Bench 4.0 | 66.4% ↗ | not reported | — | — |
| Terminal-Bench Science 0.1 | 58.7% ↗ | not reported | — | — |
| Only GPT-5.4 reports · 19 | ||||
| GPQA Diamond | not reported | 92.8% ↗ | — | — |
| AIME 2026 | not reported | 99.2% ↗matharena ⚠ | — | — |
| Humanity's Last Exam (no tools) | not reported | 39.8% ↗ | — | — |
| LMArena Elo | not reported | 1452.6 ↗ | — | — |
| BrowseComp | not reported | 82.7% ↗ | — | — |
| FrontierMath Tier 4 v2 (Epoch AI run) | not reported | 49% ↗epoch | — | — |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | not reported | 78.6% ↗epoch | — | — |
| GDPval (wins or ties) | not reported | 83% ↗ | — | — |
| MCP Atlas | not reported | 67.2% ↗ | — | — |
| MMMU-Pro (no tools) | not reported | 81.2% ↗ | — | — |
| MMMU-Pro (with tools) | not reported | 82.1% ↗ | — | — |
| OSWorld-Verified | not reported | 75% ↗ | — | — |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | not reported | 97.8% ↗epoch | — | — |
| SimpleQA Verified | not reported | 45.1% ↗epoch | — | — |
| SWE-Bench Pro | not reported | 57.7% ↗ | — | — |
| SWE-bench Verified (Epoch AI run) | not reported | 76.9% ↗epoch | — | — |
| Tau2-bench Telecom | not reported | 98.9% ↗ | — | — |
| Terminal-Bench 2.0 | not reported | 75.1% ↗ | — | — |
| Toolathlon | not reported | 54.6% ↗ | — | — |
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 Claude Opus 5.5 minus GPT-5.4 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 | Claude Opus 5.5 | GPT-5.4 | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1.1M tokens | GPT-5.4 |
| Max output | 128K tokens | 128K tokens | Tie |
| Input price / 1M | $4 ↗ | $2.5 ↗ | GPT-5.4 |
| Output price / 1M | $20 ↗ | $15 ↗ | GPT-5.4 |
| Cached input / 1M | $0.2 ↗ | $0.25 ↗ | Claude Opus 5.5 |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $24 | $17.5 | GPT-5.4 |
| Modalities | text · vision | text · vision | Tie |
| Released | 2026-09-22 | 2026-03-05 | — |
| Cited benchmark scores | 9 | 21 | — |
Reliability
Provider status
Live from /statusMore matchups
Claude Opus 5.5 vs …
Models sharing the most benchmarksMore matchups
GPT-5.4 vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Claude Opus 5.5 and GPT-5.4 on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.