Which is cheaper, Gemini 2.5 Flash or Grok 4.3?

Gemini 2.5 Flash. On a task of 1,500 input and 500 output tokens across 3 calls, Gemini 2.5 Flash costs $0.00510 per task against $0.00938 for Grok 4.3, which makes it 1.84x cheaper (a 46% saving).

How much do Gemini 2.5 Flash and Grok 4.3 charge per million tokens?

Gemini 2.5 Flash: $0.3 per million input tokens and $2.5 per million output tokens. Grok 4.3: $1.25 input and $2.5 output. These are published list rates as of August 2026, excluding cached, batch and long-context tiers.

What does a million tasks cost on Gemini 2.5 Flash vs Grok 4.3?

At the same fixed profile, one million tasks cost $5,100 on Gemini 2.5 Flash and $9,375 on Grok 4.3. The gap comes entirely from list-price differences, not from any difference in the work done.

Model price comparisons · August 2026

Gemini 2.5 Flash vs Grok 4.3: API pricing compared

Same task, same tokens, two invoices. Every figure on this page is computed from our open pricing dataset, not copied from a blog post.

Gemini 2.5 Flash is 1.84x cheaper than Grok 4.3 on a realistic task profile of 1,500 input and 500 output tokens per call, 3 calls per task: $0.00510 against $0.00938 per task, a 46% saving on identical work. Run a million tasks a month and that is the difference between $5,100 and $9,375.

Model	Input $/1M tok	Output $/1M tok	Output multiple	$/task	$/1M tasks
Gemini 2.5 FlashGoogle · fast	$0.3	$2.5	8.33x	$0.00510	$5,100
Grok 4.3xAI · mid	$1.25	$2.5	2x	$0.00938	$9,375

Monthly bill at three volumes

Tasks / month	Gemini 2.5 Flash	Grok 4.3	Gap
10,000	$51	$94	$43
100,000	$510	$938	$428
1,000,000	$5,100	$9,375	$4,275

Where the money goes on each

Gemini 2.5 Flash prices output at 8.33x its input rate, so on this profile output is 74% of its task cost. Grok 4.3 prices output at 2x input, putting output at 40% of cost. The model with the higher output multiple rewards capping response length more; the one with the higher input share rewards prompt caching and context trimming more. Cost tells you nothing about quality: run both on twenty of your real cases before deciding, and treat the cheaper model as the default until it demonstrably fails.

Break-even against a dedicated GPU

Against a $2/hour dedicated instance ($1,460/month fixed), self-hosting overtakes Gemini 2.5 Flash at 286,275 tasks per month and overtakes Grok 4.3 at 155,733 tasks per month. The full method is in the self-hosting break-even guide.

Pricing the self-hosted side? Compare on-demand GPU rates:

Compare GPU cloud pricing →

Plug your own token counts into the $/task calculator, or read the full ten-model pricing comparison.

Compare against other models

Frequently asked

Which is cheaper, Gemini 2.5 Flash or Grok 4.3?: Gemini 2.5 Flash. On a task of 1,500 input and 500 output tokens across 3 calls, Gemini 2.5 Flash costs $0.00510 per task against $0.00938 for Grok 4.3, which makes it 1.84x cheaper (a 46% saving).
How much do Gemini 2.5 Flash and Grok 4.3 charge per million tokens?: Gemini 2.5 Flash: $0.3 per million input tokens and $2.5 per million output tokens. Grok 4.3: $1.25 input and $2.5 output. These are published list rates as of August 2026, excluding cached, batch and long-context tiers.
What does a million tasks cost on Gemini 2.5 Flash vs Grok 4.3?: At the same fixed profile, one million tasks cost $5,100 on Gemini 2.5 Flash and $9,375 on Grok 4.3. The gap comes entirely from list-price differences, not from any difference in the work done.