As of August 25, 2026, GLM-4.6V-FlashX is 37% cheaper per million tokens than Grok 4 Fast. GLM-4.6V-FlashX is $0.04 / $0.40 per million input/output tokens versus Grok 4 Fast at $0.20 / $0.50. Sources: https://docs.z.ai/guides/overview/pricing and https://docs.x.ai/docs/models
Sources: Z AI pricing (https://docs.z.ai/guides/overview/pricing); xAI API pricing (https://docs.x.ai/docs/models)
GLM-4.6V-FlashX
Z AI
Input
$0.04
Output
$0.40
Grok 4 Fast
xAI
Input
$0.20
Output
$0.50
Token pricing, specs, and benchmarks side by side
GLM-4.6V-FlashXGrok 4 FastVerdict
Both models are closely matched on benchmarks. GLM-4.6V-FlashX has the pricing advantage, making it the better value unless Grok 4 Fast's specific capabilities are critical to your workflow.
As of August 25, 2026, GLM-4.6V-FlashX is 37% cheaper on blended LLM API pricing. GLM-4.6V-FlashX costs $0.04 per million input tokens and $0.40 per million output tokens ($0.44 blended 1M-in + 1M-out). Grok 4 Fast costs $0.20 / $0.50 per million tokens ($0.70 blended). Sources: https://docs.z.ai/guides/overview/pricing and https://docs.x.ai/docs/models. The cheapest LLM for your app still depends on how many output tokens you generate.
GLM-4.6V-FlashX Z AI API pricing is $0.04 input and $0.40 output per million tokens via Z AI. Grok 4 Fast xAI API pricing is $0.20 input and $0.50 output per million tokens via xAI. 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%. GLM-4.6V-FlashX does not have that eval on this page yet.
GLM-4.6V-FlashX supports a 131K token context window, while Grok 4 Fast supports 2M 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 GLM-4.6V-FlashX and Grok 4 Fast 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 GLM-4.6V-FlashX and Grok 4 Fast are production API models. For cost-sensitive production traffic, GLM-4.6V-FlashX 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 GLM-4.6V-FlashX through Z AI and Grok 4 Fast through xAI 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 Z AI API pricing and xAI API pricing, quoted per million tokens. Official rate sheets: https://docs.z.ai/guides/overview/pricing and https://docs.x.ai/docs/models. 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.
GLM-4.6V-FlashX supports up to an unspecified number of output tokens per request, while Grok 4 Fast supports up to 30K 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 GLM-4.6V-FlashX 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 GLM-4.6V-FlashX or Grok 4 Fast 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. GLM-4.6V-FlashX costs $0.04/M input and $0.40/M output. Grok 4 Fast costs $0.20/M input and $0.50/M output.
Rank both on the LLM leaderboard, SWE-bench, and Humanity's Last Exam.
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