As of August 20, 2026, Grok 4 Fast is 90% cheaper per million tokens than Magistral Medium. Grok 4 Fast is $0.20 / $0.50 per million input/output tokens versus Magistral Medium at $2.00 / $5.00. Sources: https://docs.x.ai/docs/models and https://anotherwrapper.com/tools/llm-pricing
Sources: xAI API pricing (https://docs.x.ai/docs/models); AnotherWrapper LLM pricing (https://anotherwrapper.com/tools/llm-pricing)
Grok 4 Fast
xAI
Input
$0.20
Output
$0.50
Magistral Medium
Mistral
Input
$2.00
Output
$5.00
Token pricing, specs, and benchmarks side by side
Grok 4 FastMagistral MediumVerdict
Grok 4 Fast 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, Grok 4 Fast is 90% cheaper on blended LLM API pricing. Grok 4 Fast costs $0.20 per million input tokens and $0.50 per million output tokens ($0.70 blended 1M-in + 1M-out). Magistral Medium costs $2.00 / $5.00 per million tokens ($7.00 blended). Sources: https://docs.x.ai/docs/models and https://anotherwrapper.com/tools/llm-pricing. The cheapest LLM for your app still depends on how many output tokens you generate.
Grok 4 Fast xAI API pricing is $0.20 input and $0.50 output per million tokens via xAI. Magistral Medium Mistral API pricing is $2.00 input and $5.00 output per million tokens via Mistral AI. Use those four numbers, not ChatGPT Plus or Claude Pro subscription prices, when you are comparing APIs.
Grok 4 Fast leads on LiveCodeBench: Grok 4 Fast at 80% vs Magistral Medium at 50.3%. SWE-bench measures real GitHub fixes; LiveCodeBench measures contest programming.
Grok 4 Fast supports a 2M token context window, while Magistral Medium supports 40K tokens. Grok 4 Fast 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.
Grok 4 Fast leads on 6 of 6 shared benchmarks versus Magistral Medium'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 Grok 4 Fast and Magistral Medium are production API models. For cost-sensitive production traffic, Grok 4 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.
Yes. Call Grok 4 Fast through xAI and Magistral Medium through Mistral AI 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 xAI API pricing and Mistral API pricing, quoted per million tokens. Official rate sheets: https://docs.x.ai/docs/models and https://anotherwrapper.com/tools/llm-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.
Grok 4 Fast supports up to 30K output tokens per request, while Magistral Medium supports up to an unspecified number of output tokens. Output tokens are usually the expensive half of API pricing, so a higher max output cap is a capability, not a discount.
Grok 4 Fast has a measured throughput of approximately 90 tokens/second. Throughput data for Magistral Medium 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.
Use the model pickers at the top of this LLM comparison. Search any model in the index and the URL updates. Open Grok 4 Fast or Magistral 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.
This comparison covers API pricing, context window, throughput, and benchmark scores. Grok 4 Fast costs $0.20/M input and $0.50/M output. Magistral Medium costs $2.00/M input and $5.00/M output via Mistral AI.
Rank both on the LLM leaderboard, SWE-bench, and Humanity's Last Exam.
The index
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