SIDE BY SIDE
GPT-5.1 vs GPT-5.2 Chat
Both are GPT models. GPT-5.2 Chat was added to OpenRouter on 2025-12-10, GPT-5.1 on 2025-11-13.
| Field | GPT-5.1 | GPT-5.2 Chat |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Family | GPT | GPT |
| Province | Maple Highlands | Maple Highlands |
| Context window | 400K tokens | 128K tokens |
| Maximum output | 128K tokens | 32K tokens |
| Input / 1M tokens | $1.25 | $1.75 |
| Output / 1M tokens | $10.0 | $14.0 |
| Accepts | text, files, images | text, files, images |
| Produces | text | text |
| Reasoning | Yes | No |
| Tool use | Yes | Yes |
| Added to OpenRouter | 2025-11-13 | 2025-12-10 |
| Model ID | openai/gpt-5.1 | openai/gpt-5.2-chat |
Questions and answers
Which is cheaper, GPT-5.1 or GPT-5.2 Chat?
GPT-5.1 costs less for both input ($1.25 vs $1.75) and output ($10.0 vs $14.0) per million tokens. On input, GPT-5.1 is 29% cheaper.
Which has the larger context window?
GPT-5.1: 400K tokens against 128K for GPT-5.2 Chat (3.1× as long).
What can one do that the other cannot?
Only GPT-5.1 supports reasoning.
Answers are computed from the 2026-10-24 catalog snapshot.