As of August 20, 2026, Devstral Medium is 81% cheaper per million tokens than GPT-4o. Devstral Medium is $0.40 / $2.00 per million input/output tokens versus GPT-4o at $2.50 / $10.00. Sources: https://docs.mistral.ai/platform/pricing/ and https://developers.openai.com/api/docs/pricing
Sources: Mistral AI pricing (https://docs.mistral.ai/platform/pricing/); OpenAI API pricing (https://developers.openai.com/api/docs/pricing)
Devstral Medium
Mistral
Input
$0.40
Output
$2.00
GPT-4o
OpenAI
Input
$2.50
Output
$10.00
Token pricing, specs, and benchmarks side by side
Devstral MediumGPT-4oVerdict
Both models are closely matched on benchmarks. Devstral Medium has the pricing advantage, making it the better value unless GPT-4o's specific capabilities are critical to your workflow.
As of August 20, 2026, Devstral Medium is 81% cheaper on blended LLM API pricing. Devstral Medium costs $0.40 per million input tokens and $2.00 per million output tokens ($2.40 blended 1M-in + 1M-out). GPT-4o costs $2.50 / $10.00 per million tokens ($12.50 blended). Sources: https://docs.mistral.ai/platform/pricing/ and https://developers.openai.com/api/docs/pricing. The cheapest LLM for your app still depends on how many output tokens you generate.
Devstral Medium Mistral API pricing is $0.40 input and $2.00 output per million tokens via Mistral AI. GPT-4o OpenAI API pricing is $2.50 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.
Devstral Medium has a published SWE-bench Verified score of 61.6%. GPT-4o does not have that eval on this page yet.
Devstral Medium supports a 128K token context window, while GPT-4o supports 128K 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.
Shared benchmark scores for Devstral Medium and GPT-4o 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.
Both Devstral Medium and GPT-4o are production API models. For cost-sensitive production traffic, Devstral 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.
Yes. Call Devstral Medium through Mistral AI and GPT-4o 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 Mistral API pricing and OpenAI API pricing, quoted per million tokens. Official rate sheets: https://docs.mistral.ai/platform/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.
Devstral Medium supports up to 128K output tokens per request, while GPT-4o supports up to 4K output tokens. Output tokens are usually the expensive half of API pricing, so a higher max output cap is a capability, not a discount.
Devstral Medium runs at approximately 137.1 tokens/second while GPT-4o runs at 100 tokens/second. Devstral 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.
Use the model pickers at the top of this LLM comparison. Search any model in the index and the URL updates. Open Devstral Medium or GPT-4o 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. Devstral Medium costs $0.40/M input and $2.00/M output via Mistral AI. GPT-4o costs $2.50/M input and $10.00/M output.
Rank both on the LLM leaderboard, SWE-bench, and Humanity's Last Exam.
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