Which is cheaper, GPT-5.1 Codex Mini or o1-mini?
As of August 25, 2026, GPT-5.1 Codex Mini is 85% cheaper on blended LLM API pricing. GPT-5.1 Codex Mini costs $0.25 per million input tokens and $2.00 per million output tokens ($2.25 blended 1M-in + 1M-out). o1-mini costs $3.00 / $12.00 per million tokens ($15.00 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-5.1 Codex Mini vs o1-mini cost per million tokens?
GPT-5.1 Codex Mini OpenAI API pricing is $0.25 input and $2.00 output per million tokens via OpenAI. o1-mini OpenAI API pricing is $3.00 input and $12.00 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-5.1 Codex Mini or o1-mini?
o1-mini has a published HumanEval score of 92.4%. GPT-5.1 Codex Mini does not have that eval on this page yet.
What is the context window for GPT-5.1 Codex Mini vs o1-mini?
GPT-5.1 Codex Mini supports a 400K token context window, while o1-mini supports 128K tokens. GPT-5.1 Codex Mini offers a larger context window. 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-5.1 Codex Mini or o1-mini?
o1-mini leads on 1 of 1 shared benchmarks versus GPT-5.1 Codex Mini's 0 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-5.1 Codex Mini or o1-mini better for production use?
Both GPT-5.1 Codex Mini and o1-mini are production API models. For cost-sensitive production traffic, GPT-5.1 Codex Mini 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-5.1 Codex Mini and o1-mini in my app?
Yes. Call GPT-5.1 Codex Mini through OpenAI and o1-mini 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-5.1 Codex Mini vs o1-mini 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-5.1 Codex Mini and o1-mini?
GPT-5.1 Codex Mini supports up to 128K output tokens per request, while o1-mini supports up to 66K 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-5.1 Codex Mini or o1-mini?
GPT-5.1 Codex Mini runs at approximately 200 tokens/second while o1-mini runs at 115 tokens/second. GPT-5.1 Codex Mini 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-5.1 Codex Mini vs o1-mini comparison?
Use the model pickers at the top of this LLM comparison. Search any model in the index and the URL updates. Open GPT-5.1 Codex Mini or o1-mini from the sidebar for the single-model API pricing page, or go back to the LLM pricing table to sort by cheapest blended cost.
