Compare / head-to-head
gpt-oss-20bvsLongCat Flash Chat
gpt-oss-20b and LongCat Flash Chat split their 4 shared benchmarks evenly. gpt-oss-20b has the larger context window (131K tokens).
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
2 – 2
even split
Cheaper per token
—
list price, input + output
Larger context
gpt-oss-20b
131K tokens
Provider uptime (30d)
95.5679% · —
OpenAI · Meituan LongCat
gpt-oss-20b
OpenAI · released 2025-08-05
text
- Context
- 131K
- Max out
- 131K
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 6 · 5 core
LongCat Flash Chat
Meituan LongCat · released 2025-09-01
text
- Context
- 128K
- Max out
- —
- Input /1M
- —
- Output /1M
- —
- Cached /1M
- —
- Scores
- 31 · 9 core
Quality
Benchmark matrix
4 shared · 1 only gpt-oss-20b · 27 only LongCat Flash Chat| Benchmark | gpt-oss-20b | LongCat Flash Chat | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 4 | ||||
| SWE-bench Verified | 60.7% ↗ | 60.4% ↗ | +0.3 pt | gpt-oss-20b |
| GPQA Diamond | 71.5% ↗ | 73.23% ↗ | -1.7 pt | LongCat Flash Chat |
| AIME 2025 | 89.2% ↗matharena ⚠ | 61.25% ↗ | +28 pt | gpt-oss-20b |
| LMArena Elo | 1287.3 ↗ | 1422.9 ↗ | -135.6 | LongCat Flash Chat |
| Only gpt-oss-20b reports · 1 | ||||
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 65.3% ↗epoch | not reported | — | — |
| Only LongCat Flash Chat reports · 27 | ||||
| MMLU | not reported | 89.71% ↗ | — | — |
| MMLU-Pro | not reported | 82.68% ↗ | — | — |
| AceBench | not reported | 76.1% ↗ | — | — |
| AIME 2024 | not reported | 70.42% ↗ | — | — |
| ArenaHard-V2 | not reported | 86.5% ↗ | — | — |
| BeyondAIME | not reported | 43% ↗ | — | — |
| C-Eval | not reported | 90.44% ↗ | — | — |
| CMMLU | not reported | 84.34% ↗ | — | — |
| COLLIE | not reported | 57.1% ↗ | — | — |
| DROP | not reported | 79.06% ↗ | — | — |
| GraphWalks-128k | not reported | 51.05% ↗ | — | — |
| HumanEval+ | not reported | 88.41% ↗ | — | — |
| IFEval | not reported | 89.65% ↗ | — | — |
| LiveCodeBench | not reported | 48.02% ↗ | — | — |
| MATH500 | not reported | 96.4% ↗ | — | — |
| MBPP+ | not reported | 79.63% ↗ | — | — |
| Meeseeks-zh | not reported | 43.03% ↗ | — | — |
| Safety: Criminal | not reported | 91.24% ↗ | — | — |
| Safety: Harmful | not reported | 83.98% ↗ | — | — |
| Safety: Misinformation | not reported | 81.72% ↗ | — | — |
| Safety: Privacy | not reported | 93.98% ↗ | — | — |
| Tau2-Bench (airline) | not reported | 58% ↗ | — | — |
| Tau2-Bench (retail) | not reported | 71.27% ↗ | — | — |
| Tau2-Bench (telecom) | not reported | 73.68% ↗ | — | — |
| TerminalBench | not reported | 39.51% ↗ | — | — |
| VitaBench | not reported | 24.3% ↗ | — | — |
| ZebraLogic | not reported | 89.3% ↗ | — | — |
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 gpt-oss-20b minus LongCat Flash Chat 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 | gpt-oss-20b | LongCat Flash Chat | Edge |
|---|---|---|---|
| Context window | 131K tokens | 128K tokens | gpt-oss-20b |
| Max output | 131K tokens | — | — |
| 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 | 2025-08-05 | 2025-09-01 | — |
| Cited benchmark scores | 6 | 31 | — |
Reliability
Provider status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
gpt-oss-20b vs …
Models sharing the most benchmarksMore matchups
LongCat Flash Chat vs …
Models sharing the most benchmarksBuilt by Respan
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