As of August 20, 2026, o4-mini is 56% cheaper per million tokens than Gemini 1.5 Pro. Gemini 1.5 Pro is $2.50 / $10.00 per million input/output tokens versus o4-mini at $1.10 / $4.40. Sources: https://ai.google.dev/gemini-api/docs/pricing and https://developers.openai.com/api/docs/pricing
Sources: Gemini API pricing (https://ai.google.dev/gemini-api/docs/pricing); OpenAI API pricing (https://developers.openai.com/api/docs/pricing)
Gemini 1.5 Pro
Input
$2.50
Output
$10.00
o4-mini
OpenAI
Input
$1.10
Output
$4.40
Token pricing, specs, and benchmarks side by side
Gemini 1.5 Proo4-miniVerdict
o4-mini offers both lower pricing and stronger benchmark performance across the board, making it the clear value leader in this comparison.
As of August 20, 2026, o4-mini is 56% cheaper on blended LLM API pricing. o4-mini costs $1.10 per million input tokens and $4.40 per million output tokens ($5.50 blended 1M-in + 1M-out). Gemini 1.5 Pro costs $2.50 / $10.00 per million tokens ($12.50 blended). Sources: https://ai.google.dev/gemini-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.
Gemini 1.5 Pro Gemini API pricing is $2.50 input and $10.00 output per million tokens via Google. o4-mini OpenAI API pricing is $1.10 input and $4.40 output per million tokens via OpenAI. Use those four numbers, not ChatGPT Plus or Claude Pro subscription prices, when you are comparing APIs.
o4-mini has a published SWE-bench Verified score of 68.1%. Gemini 1.5 Pro does not have that eval on this page yet.
Gemini 1.5 Pro supports a 2M token context window, while o4-mini supports 200K tokens. Gemini 1.5 Pro 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.
o4-mini leads on 7 of 7 shared benchmarks versus Gemini 1.5 Pro'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.
Both Gemini 1.5 Pro and o4-mini are production API models. For cost-sensitive production traffic, o4-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.
Yes. Call Gemini 1.5 Pro through Google and o4-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.
List rates are the latest published Gemini API pricing and OpenAI API pricing, quoted per million tokens. Official rate sheets: https://ai.google.dev/gemini-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.
Gemini 1.5 Pro supports up to 8K output tokens per request, while o4-mini 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.
Gemini 1.5 Pro runs at approximately 85 tokens/second while o4-mini runs at 115 tokens/second. o4-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.
Use the model pickers at the top of this LLM comparison. Search any model in the index and the URL updates. Open Gemini 1.5 Pro or o4-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.
This comparison covers API pricing, context window, throughput, and benchmark scores. Gemini 1.5 Pro costs $2.50/M input and $10.00/M output. o4-mini costs $1.10/M input and $4.40/M output.
Rank both on the LLM leaderboard, SWE-bench, and Humanity's Last Exam.
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