Which is cheaper, GPT-5 Medium or GPT-5.1 Medium?
As of August 25, 2026, GPT-5 Medium is 0% cheaper on blended LLM API pricing. GPT-5 Medium costs $1.25 per million input tokens and $10.00 per million output tokens ($11.25 blended 1M-in + 1M-out). GPT-5.1 Medium costs $1.25 / $10.00 per million tokens ($11.25 blended). Sources: https://developers.openai.com/api/docs/pricing and https://developers.openai.com/api/docs/pricing. The cheapest LLM for your app still depends on how many output tokens you generate.
How much does GPT-5 Medium vs GPT-5.1 Medium cost per million tokens?
GPT-5 Medium OpenAI API pricing is $1.25 input and $10.00 output per million tokens via OpenAI. GPT-5.1 Medium OpenAI API pricing is $1.25 input and $10.00 output per million tokens via OpenAI. Use those four numbers, not ChatGPT Plus or Claude Pro subscription prices, when you are comparing APIs.
Which is better for coding, GPT-5 Medium or GPT-5.1 Medium?
Neither GPT-5 Medium nor GPT-5.1 Medium has a published SWE-bench or LiveCodeBench score on this page yet. Use the comparison table for the evals that do exist.
What is the context window for GPT-5 Medium vs GPT-5.1 Medium?
GPT-5 Medium supports a 400K token context window, while GPT-5.1 Medium supports 400K tokens. Both models have the same context window size. Filling a larger window bills more input tokens, so the cheaper-per-million model can still cost more on long documents.
Which model performs better on benchmarks, GPT-5 Medium or GPT-5.1 Medium?
GPT-5.1 Medium leads on 2 of 3 shared benchmarks versus GPT-5 Medium's 1 wins. Check the comparison table for GPQA Diamond, SWE-bench, MMLU, HLE, and the other evals we track. Token price and benchmark score together are the usual LLM comparison, not either number alone.
Is GPT-5 Medium or GPT-5.1 Medium better for production use?
Both GPT-5 Medium and GPT-5.1 Medium are production API models. For cost-sensitive production traffic, GPT-5 Medium has better economics on the blended 1M-in + 1M-out scale. For maximum capability, weight the benchmark table for your domain. Many production stacks route cheap models for drafts and a frontier model for the hard turn, which is usually cheaper than sending everything to the expensive API.
Can I switch between GPT-5 Medium and GPT-5.1 Medium in my app?
Yes. Call GPT-5 Medium through OpenAI and GPT-5.1 Medium through OpenAI with separate API keys, or through a gateway that already wraps both. Keep prompts in tokens, not characters, when you estimate the invoice. AnotherWrapper templates can swap providers without rewriting auth and billing.
How accurate is this GPT-5 Medium vs GPT-5.1 Medium pricing data?
List rates are the latest published OpenAI API pricing and OpenAI API pricing, quoted per million tokens. Official rate sheets: https://developers.openai.com/api/docs/pricing and https://developers.openai.com/api/docs/pricing. Prompt caching, batch APIs, and committed-use discounts can change the invoice. Benchmark scores are from official publications and independent evals, updated as new numbers land.
What is the output token limit for GPT-5 Medium and GPT-5.1 Medium?
GPT-5 Medium supports up to 128K output tokens per request, while GPT-5.1 Medium supports up to 128K output tokens. Output tokens are usually the expensive half of API pricing, so a higher max output cap is a capability, not a discount.
Which model has better throughput, GPT-5 Medium or GPT-5.1 Medium?
GPT-5 Medium runs at approximately 90 tokens/second while GPT-5.1 Medium runs at 90 tokens/second. GPT-5.1 Medium is faster in raw throughput. Throughput (tokens per second) and time-to-first-token are why two models with the same per-million-token price can still feel different in chat and agents.
How do I switch the models in this GPT-5 Medium vs GPT-5.1 Medium comparison?
Use the model pickers at the top of this LLM comparison. Search any model in the index and the URL updates. Open GPT-5 Medium or GPT-5.1 Medium from the sidebar for the single-model API pricing page, or go back to the LLM pricing table to sort by cheapest blended cost.
