As of August 30, 2026, MedGemma 4B IT is 91% cheaper per million tokens than Grok 4 Fast. Grok 4 Fast is $0.20 / $0.50 per million input/output tokens versus MedGemma 4B IT at $0.02 / $0.04. Sources: https://docs.x.ai/docs/models and https://ai.google.dev/gemini-api/docs/pricing
Sources: xAI API pricing (https://docs.x.ai/docs/models); Gemini API pricing (https://ai.google.dev/gemini-api/docs/pricing)
Grok 4 Fast
xAI
Input
$0.20
Output
$0.50
MedGemma 4B IT
Input
$0.02
Output
$0.04
Token pricing, specs, and benchmarks side by side
Grok 4 FastMedGemma 4B ITVerdict
Both models are closely matched on benchmarks. MedGemma 4B IT has the pricing advantage, making it the better value unless Grok 4 Fast's specific capabilities are critical to your workflow.
As of August 30, 2026, MedGemma 4B IT is 91% cheaper on blended LLM API pricing. MedGemma 4B IT costs $0.02 per million input tokens and $0.04 per million output tokens ($0.06 blended 1M-in + 1M-out). Grok 4 Fast costs $0.20 / $0.50 per million tokens ($0.70 blended). Sources: https://docs.x.ai/docs/models and https://ai.google.dev/gemini-api/docs/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. MedGemma 4B IT Gemini API pricing is $0.02 input and $0.04 output per million tokens via Google. Use those four numbers, not ChatGPT Plus or Claude Pro subscription prices, when you are comparing APIs.
Grok 4 Fast has a published LiveCodeBench score of 80%. MedGemma 4B IT does not have that eval on this page yet.
Grok 4 Fast supports a 2M token context window, while MedGemma 4B IT supports 33K 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.
Shared benchmark scores for Grok 4 Fast and MedGemma 4B IT 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 Grok 4 Fast and MedGemma 4B IT are production API models. For cost-sensitive production traffic, MedGemma 4B IT 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 MedGemma 4B IT through Google 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 Gemini API pricing, quoted per million tokens. Official rate sheets: https://docs.x.ai/docs/models and https://ai.google.dev/gemini-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.
Grok 4 Fast supports up to 30K output tokens per request, while MedGemma 4B IT 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 MedGemma 4B IT 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 MedGemma 4B IT 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. MedGemma 4B IT costs $0.02/M input and $0.04/M output.
Rank both on the LLM leaderboard, SWE-bench, and Humanity's Last Exam.
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