gpt-oss-120b vs LongCat Flash Chat
| Spec | gpt-oss-120b | LongCat Flash Chat |
|---|---|---|
| Respan Index | 16.5 (#139) | 16.8 (#138) |
| Blended price per 1M | $0.039 | - |
| Context window | 131K | 128K |
| Input / output per 1M | $0.023 / $0.086 | - |
| Max output | 131K | - |
| Input | text | text |
| Released | 2025-08-05 | 2025-09-01 |
Respan Index by category
Each category is scored 0 to 100, and how far ahead the winner is. Leads under a point are close to even.
| Category | gpt-oss-120b | LongCat Flash Chat |
|---|---|---|
| Coding | 7.0 gpt-oss-120b | 3.6 LongCat Flash Chat |
| Agents | 7.6 gpt-oss-120b | 12.0* LongCat Flash Chat |
| Reasoning | 23.0 gpt-oss-120b | 19.1 LongCat Flash Chat |
| Knowledge & language | 12.4* gpt-oss-120b | 14.0 LongCat Flash Chat |
| Human preference | 38.8 gpt-oss-120b | 45.0 LongCat Flash Chat |
* Estimated: no published scores in that category. How the Respan Index works
Benchmarks both report
gpt-oss-120b leads on 3 of the 4 benchmarks both report. Higher is better. Each score links to where it was published.
FAQ
Is gpt-oss-120b better than LongCat Flash Chat?
LongCat Flash Chat scores 16.8 on the Respan Index (#138), ahead of gpt-oss-120b at 16.5 (#139). gpt-oss-120b leads on 3 of the 4 benchmarks both report.
Which has the larger context window?
gpt-oss-120b accepts 131K tokens and LongCat Flash Chat 128K tokens.