Compare / head-to-head
LongCat 2.0vsStep 3.5 Flash
LongCat 2.0 leads 1 of 1 shared benchmark. LongCat 2.0 has the larger context window (1M tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
1 – 0
LongCat 2.0 leads
Cheaper per token
—
list price, input + output
Larger context
LongCat 2.0
1M tokens
Provider uptime (30d)
— · —
Meituan LongCat · StepFun
LongCat 2.0
Meituan LongCat · released 2026-06-30
text
- Context
- 1M
- Max out
- —
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 10 · 4 core
Step 3.5 Flash
StepFun · released 2026-02-12
text
- Context
- 256K
- Max out
- —
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 18 · 5 core
Quality
Benchmark matrix
1 shared · 9 only LongCat 2.0 · 16 only Step 3.5 Flash| Benchmark | LongCat 2.0 | Step 3.5 Flash | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 1 | ||||
| BrowseComp | 79.9% ↗ | 51.6% ↗ | +28.3 pt | LongCat 2.0 |
| Only LongCat 2.0 reports · 9 | ||||
| GPQA Diamond | 88.9% ↗ | not reported | — | — |
| FORTE | 73.2% ↗ | not reported | — | — |
| IFEval | 90% ↗ | not reported | — | — |
| IMO-AnswerBench | 81.8% ↗ | not reported | — | — |
| RWSearch | 78.8% ↗ | not reported | — | — |
| SWE-bench Multilingual | 77.3% ↗ | not reported | — | — |
| SWE-bench Pro | 59.5% ↗ | not reported | — | — |
| Terminal-Bench 2.1 | 70.8% ↗ | not reported | — | — |
| Writing Bench | 83.8% ↗ | not reported | — | — |
| Only Step 3.5 Flash reports · 16 | ||||
| SWE-bench Verified | not reported | 74.4% ↗ | — | — |
| AIME 2025 | not reported | 97.3% ↗ | — | — |
| AIME 2026 | not reported | 96.7% ↗matharena | — | — |
| LMArena Elo | not reported | 1403.7 ↗ | — | — |
| BrowseComp (with context manager) | not reported | 69% ↗ | — | — |
| BrowseComp-ZH | not reported | 66.9% ↗ | — | — |
| BrowseComp-ZH (with context manager) | not reported | 73.7% ↗ | — | — |
| GAIA (no file) | not reported | 84.5% ↗ | — | — |
| HMMT 2025 (Feb/Nov average) | not reported | 96.2% ↗ | — | — |
| IMOAnswerBench | not reported | 85.4% ↗ | — | — |
| LiveCodeBench v6 | not reported | 86.4% ↗ | — | — |
| ResearchRubrics | not reported | 65.3% ↗ | — | — |
| Tau2-Bench | not reported | 88.2% ↗ | — | — |
| Terminal-Bench 2.0 | not reported | 51% ↗ | — | — |
| xbench-DeepSearch 2025.05 | not reported | 83.7% ↗ | — | — |
| xbench-DeepSearch 2025.10 | not reported | 56.3% ↗ | — | — |
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 LongCat 2.0 minus Step 3.5 Flash 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 | LongCat 2.0 | Step 3.5 Flash | Edge |
|---|---|---|---|
| Context window | 1M tokens | 256K tokens | LongCat 2.0 |
| Max output | — | — | — |
| Input price / 1M | — | — | — |
| Output price / 1M | — | — | — |
| Cached input / 1M | — | — | — |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | — | — | — |
| Modalities | text | text | Tie |
| Released | 2026-06-30 | 2026-02-12 | — |
| Cited benchmark scores | 10 | 18 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
LongCat 2.0 vs …
Models sharing the most benchmarksMore matchups
Step 3.5 Flash vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run LongCat 2.0 and Step 3.5 Flash on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.