Model comparison
Mercury 2 vs Step 3.7 Flash
Mercury 2 is the stronger model overall, scoring 39.1 to 37.3 on the Noometry Index.
Last verified . 3 shared benchmarks.
StepFunSummary
- They share 3 benchmarks with published results for both. Mercury 2 scores higher in 1 category and Step 3.7 Flash in 1 category; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where Step 3.7 Flash leads 40.0 to 33.5.
- Mercury 2 is cheaper at $0.25 / $0.75 per million input/output tokens, against $0.18 / $1.11 for Step 3.7 Flash.
- Step 3.7 Flash accepts more context: 256K tokens versus 128K.
- Step 3.7 Flash has downloadable open weights; the other is API-only.
Side by side
| Mercury 2 | Step 3.7 Flash | |
|---|---|---|
| Provider | Inception | StepFun |
| Noometry Index | 39.1 | 37.3 |
| Released | 2026-02-20 | 2026-05-29 |
| Weights | Proprietary | Open |
| Context window | 128K | 256K |
| Max output | 50K | 256K |
| Input $ / M tokens | $0.25 | $0.18 |
| Output $ / M tokens | $0.75 | $1.11 |
| Results tracked | 17 | 5 |
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Category by category
Coding Step 3.7 Flash leads
Mercury 2: 33.5 (#255), Step 3.7 Flash: 40.0 (#150)
| Benchmark | Mercury 2 | Step 3.7 Flash |
|---|---|---|
| SciCode | 38.7% | 40% |
| ALE-Bench | 785.58 | 694.12 |
| LMArena WebDev | 1171 | — |
| WeirdML | 43.2% | — |
| LMArena Coding | 1391 | — |
Reasoning Mercury 2 leads
Mercury 2: 23.8 (#170), Step 3.7 Flash: 21.6 (#219)
| Benchmark | Mercury 2 | Step 3.7 Flash |
|---|---|---|
| CritPt | 0.8% | 2.3% |
| NYT Connections (extended) | — | 39.7% |
| LMArena Hard Prompts | 1362 | — |
Math Not comparable
Mercury 2: —, Step 3.7 Flash: 42.9 (#82)
| Benchmark | Mercury 2 | Step 3.7 Flash |
|---|---|---|
| MathArena Final-Answer Competitions | — | 68.5% |
Knowledge Not comparable
Mercury 2: 36.2 (#172), Step 3.7 Flash: —
| Benchmark | Mercury 2 | Step 3.7 Flash |
|---|---|---|
| Vectara Hallucination Rate | 12.3% | — |
| LMArena Expert | 1358 | — |
Multilingual Not comparable
Mercury 2: 46.6 (#157), Step 3.7 Flash: —
| Benchmark | Mercury 2 | Step 3.7 Flash |
|---|---|---|
| LMArena Non-English | 1331 | — |
| LMArena Chinese | 1417 | — |
| LMArena Russian | 1304 | — |
Instruction Following Not comparable
Mercury 2: 70.2 (#165), Step 3.7 Flash: —
| Benchmark | Mercury 2 | Step 3.7 Flash |
|---|---|---|
| LMArena Instruction Following | 1329 | — |
Long Context Not comparable
Mercury 2: 40.5 (#154), Step 3.7 Flash: —
| Benchmark | Mercury 2 | Step 3.7 Flash |
|---|---|---|
| LMArena Longer Query | 1330 | — |
Writing & Preference Not comparable
Mercury 2: 53.8 (#155), Step 3.7 Flash: —
| Benchmark | Mercury 2 | Step 3.7 Flash |
|---|---|---|
| LMArena Text | 1355 | — |
| LMArena Creative Writing | 1289 | — |
| LMArena Multi-Turn | 1358 | — |
Frequently asked questions
Is Mercury 2 better than Step 3.7 Flash?
Mercury 2 is the stronger model overall, scoring 39.1 to 37.3 on the Noometry Index.
Which is cheaper, Mercury 2 or Step 3.7 Flash?
Mercury 2 is cheaper. It lists at $0.25 per million input tokens and $0.75 per million output tokens; Step 3.7 Flash lists at $0.18 and $1.11.
Is Mercury 2 or Step 3.7 Flash better for coding?
Step 3.7 Flash scores higher on coding benchmarks: 40.0 versus 33.5 in the Noometry coding category.
Which has the bigger context window?
Step 3.7 Flash does, with 256K tokens against 128K.
How many benchmarks do Mercury 2 and Step 3.7 Flash share?
3 benchmarks have published results for both models. Mercury 2 has 17 scored results on Noometry and Step 3.7 Flash has 5.