Model comparison
Claude Opus 4.7 vs Step 5 Preview
Claude Opus 4.7 is the stronger model overall, scoring 58.3 to 47.9 on the Noometry Index. Step 5 Preview costs 7.0× less per token, which makes it the better buy when Claude Opus 4.7's lead doesn't matter for your workload.
Last verified . 18 shared benchmarks.
StepFunSummary
- They share 18 benchmarks with published results for both. Claude Opus 4.7 scores higher in 9 categories and Step 5 Preview in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Claude Opus 4.7 leads 62.6 to 41.2.
- The biggest single-benchmark swing is ProofBench: 54% for Claude Opus 4.7 and 42% for Step 5 Preview.
- Step 5 Preview is cheaper at $1 / $2.70 per million input/output tokens, against $5 / $25 for Claude Opus 4.7.
- Step 5 Preview accepts more context: 1.02M tokens versus 1M.
Side by side
| Claude Opus 4.7 | Step 5 Preview | |
|---|---|---|
| Provider | Anthropic | StepFun |
| Noometry Index | 58.3 | 47.9 |
| Released | 2026-04-14 | 2026-09-16 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1.02M |
| Max output | 128K | 66K |
| Input $ / M tokens | $5 | $1 |
| Output $ / M tokens | $25 | $2.70 |
| Results tracked | 66 | 18 |
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Category by category
Coding Claude Opus 4.7 leads
Claude Opus 4.7: 59.6 (#13), Step 5 Preview: 51.8 (#36)
| Benchmark | Claude Opus 4.7 | Step 5 Preview |
|---|---|---|
| LMArena WebDev | 1558 | 1564 |
| SciCode | 54.5% | 58.9% |
| LMArena Coding | 1518 | 1480 |
| SWE-bench Verified | 83.5% | — |
| FrontierCode | 38.5% | — |
| GSO | 44.1% | — |
| WeirdML | 76.4% | — |
| MirrorCode | 31.1% | — |
| ALE-Bench | 1,323 | — |
Agentic & Tool Use Not comparable
Claude Opus 4.7: 47.9 (#10), Step 5 Preview: —
| Benchmark | Claude Opus 4.7 | Step 5 Preview |
|---|---|---|
| Terminal-Bench | 80.2% | — |
| APEX-Agents | 49.2% | — |
| OSWorld 2.0 | 18.2% | — |
| τ²-bench Banking | 40.2% | — |
| PostTrainBench | 28.6% | — |
| ExploitBench | 26.5% | — |
| GBAEval | 43.8% | — |
| GDP.pdf | 21% | — |
| LMArena Search | 1233 | — |
| Vending-Bench 2 | 10,937 | — |
Reasoning Claude Opus 4.7 leads
Claude Opus 4.7: 53.8 (#29), Step 5 Preview: 40.0 (#57)
| Benchmark | Claude Opus 4.7 | Step 5 Preview |
|---|---|---|
| CritPt | 12% | 20.9% |
| LMArena Hard Prompts | 1506 | 1465 |
| ARC-AGI-2 | 75.8% | — |
| SimpleBench | 61.7% | — |
| Kagi LLM Benchmark | 80.7% | — |
| NYT Connections (extended) | 39% | — |
| ARC-AGI-1 | 93.5% | — |
| Chess Puzzles | 30% | — |
| Thematic Generalization | 72.8% | — |
| EBR-Bench | 19% | — |
| Mystery Game Puzzles | 28% | — |
| DTBench | 94.7% | — |
| LMCA | 52.2% | — |
| Epoch Capabilities Index | 156.25 | — |
| ForecastBench | 60.3 | — |
Math Claude Opus 4.7 leads
Claude Opus 4.7: 66.7 (#26), Step 5 Preview: 46.1 (#72)
| Benchmark | Claude Opus 4.7 | Step 5 Preview |
|---|---|---|
| ProofBench | 54% | 42% |
| LMArena Math | 1499 | 1470 |
| FrontierMath (Tiers 1-3) | 70.2% | — |
| FrontierMath Tier 4 | 31.7% | — |
| MathArena Final-Answer Competitions | 73.6% | — |
| OTIS Mock AIME 2024-2025 | 97.8% | — |
| FrontierMath (Feb 2025 set) | 43.8% | — |
| FrontierMath Tier 4 (v1) | 22.9% | — |
Knowledge Claude Opus 4.7 leads
Claude Opus 4.7: 62.6 (#23), Step 5 Preview: 41.2 (#112)
| Benchmark | Claude Opus 4.7 | Step 5 Preview |
|---|---|---|
| LMArena Expert | 1521 | 1470 |
| GPQA Diamond | 90.2% | — |
| Humanity's Last Exam | 36.2% | — |
| SimpleQA Verified | 51.7% | — |
| Vectara Hallucination Rate | 12% | — |
Multimodal Too close to call
Claude Opus 4.7: 41.2 (#38), Step 5 Preview: 41.0 (#41)
| Benchmark | Claude Opus 4.7 | Step 5 Preview |
|---|---|---|
| LMArena Vision | 1316 | 1267 |
| Blueprint-Bench 2 | 24.5% | — |
| Furniture Assembly | 33.3% | — |
| LMArena Document | 1495 | — |
Multilingual Claude Opus 4.7 leads
Claude Opus 4.7: 57.3 (#10), Step 5 Preview: 53.8 (#54)
| Benchmark | Claude Opus 4.7 | Step 5 Preview |
|---|---|---|
| LMArena Non-English | 1480 | 1432 |
| LMArena Chinese | 1531 | 1519 |
| LMArena Russian | 1494 | 1436 |
| LMArena Spanish | 1495 | 1439 |
| LMArena French | 1503 | — |
| LMArena German | 1495 | — |
| LMArena Japanese | 1472 | — |
| LMArena Korean | 1464 | — |
Instruction Following Claude Opus 4.7 leads
Claude Opus 4.7: 78.4 (#10), Step 5 Preview: 76.0 (#50)
| Benchmark | Claude Opus 4.7 | Step 5 Preview |
|---|---|---|
| LMArena Instruction Following | 1498 | 1444 |
Long Context Claude Opus 4.7 leads
Claude Opus 4.7: 46.2 (#25), Step 5 Preview: 44.5 (#64)
| Benchmark | Claude Opus 4.7 | Step 5 Preview |
|---|---|---|
| LMArena Longer Query | 1505 | 1455 |
Writing & Preference Claude Opus 4.7 leads
Claude Opus 4.7: 75.1 (#8), Step 5 Preview: 62.8 (#71)
| Benchmark | Claude Opus 4.7 | Step 5 Preview |
|---|---|---|
| LMArena Text | 1490 | 1442 |
| LMArena Creative Writing | 1486 | 1410 |
| LMArena Multi-Turn | 1505 | 1447 |
| EQ-Bench Creative Writing | 1914 | — |
| EQ-Bench 4 | 1311 | — |
Frequently asked questions
Is Claude Opus 4.7 better than Step 5 Preview?
Claude Opus 4.7 is the stronger model overall, scoring 58.3 to 47.9 on the Noometry Index. Step 5 Preview costs 7.0× less per token, which makes it the better buy when Claude Opus 4.7's lead doesn't matter for your workload.
Which is cheaper, Claude Opus 4.7 or Step 5 Preview?
Step 5 Preview is cheaper. It lists at $1 per million input tokens and $2.70 per million output tokens; Claude Opus 4.7 lists at $5 and $25.
Is Claude Opus 4.7 or Step 5 Preview better for coding?
Claude Opus 4.7 scores higher on coding benchmarks: 59.6 versus 51.8 in the Noometry coding category.
Which has the bigger context window?
Step 5 Preview does, with 1.02M tokens against 1M.
How many benchmarks do Claude Opus 4.7 and Step 5 Preview share?
18 benchmarks have published results for both models. Claude Opus 4.7 has 66 scored results on Noometry and Step 5 Preview has 18.