Compare / head-to-head
Claude Opus 5.5vs
Step 5 Preview
Claude Opus 5.5 and Step 5 Preview do not yet share a public benchmark, so quality cannot be compared apples-to-apples. Step 5 Preview is 6.5x cheaper per token. Both offer a 1M-token context window.
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
0
no overlap yet
Cheaper per token
Step 5 Preview
6.5x cheaper, input + output
Larger context
Tie
both 1M tokens
Providers
2 providers
Anthropic · StepFun
Claude Opus 5.5
Anthropic · released 2026-09-22
textvision
Step 5 Preview
StepFun · released 2026-09-20
textvisionvideo
Quality
Benchmark matrix
0 shared · 9 only Claude Opus 5.5 · 0 only Step 5 Preview| Benchmark | Claude Opus 5.5 | Step 5 Preview | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 0 | ||||
| No public benchmark is reported for both models yet. | ||||
| Only Claude Opus 5.5 reports · 9 | ||||
| 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 | — | — |
| Humanity's Last Exam (with tools) | 67.7% ↗ | 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 Step 5 Preview reports · 0 | ||||
| Step 5 Preview reports nothing Claude Opus 5.5 does not. | ||||
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 Step 5 Preview 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 | Step 5 Preview | Edge |
|---|---|---|---|
| Context window | 1M tokens | 1M tokens | Tie |
| Max output | 128K tokens | 64K tokens | Claude Opus 5.5 |
| Input price / 1M | $4 ↗ | $1 ↗ | Step 5 Preview |
| Output price / 1M | $20 ↗ | $2.7 ↗ | Step 5 Preview |
| Cached input / 1M | $0.2 ↗ | $0.05 ↗ | Step 5 Preview |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $24 | $3.7 | Step 5 Preview |
| Modalities | text · vision | text · vision · video | Step 5 Preview |
| Released | 2026-09-22 | 2026-09-20 | — |
| Cited benchmark scores | 9 | 0 | — |
Reliability
Provider status
Live from /statusMore matchups
Claude Opus 5.5 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 Step 5 Preview on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.