OpenAI: GPT-5.1 Chat vs OpenAI: GPT-5 Chat
Head-to-head API cost, context, and performance comparison. Synced at 9:54:58 AM.
Executive Summary
When evaluating OpenAI: GPT-5.1 Chat against OpenAI: GPT-5 Chat, the pricing structure is a key differentiator. Both models are remarkably similar in API costs.
However, when looking at raw reasoning capabilities, OpenAI: GPT-5.1 Chat leads with a statistical ELO score of 1360. For tasks involving complex logic, coding, or instruction-following, developers might prefer OpenAI: GPT-5.1 Chat, provided their budget allows for the API burn rate.
Raw Technical comparison
Verdict
If you are looking for pure performance and capability, OpenAI: GPT-5.1 Chat is statistically superior. However, if API burn rate is the primary concern, Tie wins out aggressively in pricing.
People Also Ask
Is OpenAI: GPT-5.1 Chat cheaper than OpenAI: GPT-5 Chat?
No. OpenAI: GPT-5 Chat is the more cost-effective model, operating at a lower price point per 1 million tokens.
Which model has the larger context window?
Both models offer an identical context window of 128,000 tokens.