Which is cheaper, Composer 2 Fast or o3-pro?
As of August 20, 2026, Composer 2 Fast is 91% cheaper on blended LLM API pricing. Composer 2 Fast costs $1.50 per million input tokens and $7.50 per million output tokens ($9.00 blended 1M-in + 1M-out). o3-pro costs $20.00 / $80.00 per million tokens ($100.00 blended). Sources: https://cursor.com/docs/models/cursor-composer-2 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 Composer 2 Fast vs o3-pro cost per million tokens?
Composer 2 Fast Cursor API pricing is $1.50 input and $7.50 output per million tokens via Cursor. o3-pro OpenAI API pricing is $20.00 input and $80.00 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, Composer 2 Fast or o3-pro?
Neither Composer 2 Fast nor o3-pro 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 Composer 2 Fast vs o3-pro?
Composer 2 Fast supports a 200K token context window, while o3-pro supports 200K 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, Composer 2 Fast or o3-pro?
Shared benchmark scores for Composer 2 Fast and o3-pro are still limited. Check the comparison table for the evals each model has published. 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 Composer 2 Fast or o3-pro better for production use?
Both Composer 2 Fast and o3-pro are production API models. For cost-sensitive production traffic, Composer 2 Fast 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 Composer 2 Fast and o3-pro in my app?
Yes. Call Composer 2 Fast through Cursor and o3-pro 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 Composer 2 Fast vs o3-pro pricing data?
List rates are the latest published Cursor API pricing and OpenAI API pricing, quoted per million tokens. Official rate sheets: https://cursor.com/docs/models/cursor-composer-2 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 Composer 2 Fast and o3-pro?
Composer 2 Fast supports up to an unspecified number of output tokens per request, while o3-pro supports up to 100K 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, Composer 2 Fast or o3-pro?
o3-pro has a measured throughput of approximately 25 tokens/second. Throughput data for Composer 2 Fast is not yet available. 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 Composer 2 Fast vs o3-pro comparison?
Use the model pickers at the top of this LLM comparison. Search any model in the index and the URL updates. Open Composer 2 Fast or o3-pro from the sidebar for the single-model API pricing page, or go back to the LLM pricing table to sort by cheapest blended cost.
