Question 1

What does this Step 3.5 Flash 2603 vs Grok Build 0.1 comparison cover?

Accepted Answer

It brings together documented inputs and outputs, token limits, deployment terms and available pricing. When both models have source-linked, verified results on a shared benchmark, those results are shown with their individual sources. The comparison is a starting point for evaluating your own workload.

Question 2

Which is cheaper: Step 3.5 Flash 2603 or Grok Build 0.1?

Accepted Answer

Step 3.5 Flash 2603 lists $0.10 input and $0.30 output per 1M tokens. Grok Build 0.1 lists $1.00 input and $2.00 output. The cheaper workload depends on the mix of input and output. Long-context tiers, caching, batch processing and retries can change the bill.

Question 3

Which has the larger context window: Step 3.5 Flash 2603 or Grok Build 0.1?

Accepted Answer

Both records list a 256K-token context window. An equal limit does not imply equal recall, instruction following, or long-context quality.

Question 4

Which is faster: Step 3.5 Flash 2603 or Grok Build 0.1?

Accepted Answer

There is no matched speed measurement for both models with the same source, host, region and date. Test the same prompts at your expected concurrency and measure time to the first useful response as well as complete task time.

Question 5

What input and output types do Step 3.5 Flash 2603 and Grok Build 0.1 support?

Accepted Answer

Step 3.5 Flash 2603 records text input and text output. Grok Build 0.1 records text, image, pdf input and text output. “Not documented” means the current source record is incomplete; it does not prove that a modality is unsupported.

Question 6

Should I choose Step 3.5 Flash 2603 or Grok Build 0.1?

Accepted Answer

Consider Step 3.5 Flash 2603 if you need a lower listed input rate or a lower listed output rate. Step 3.5 Flash 2603 offers downloadable weights; Grok Build 0.1 is listed as a proprietary model. Compare licence terms and operating costs before choosing a deployment. Test both on the same representative examples and judge the output against your acceptance criteria. Include tool failures, retries and the time to a completed task.

Specification	Step 3.5 Flash 2603	Grok Build 0.1
Provider	StepFun	xAI
Listed pricing route	StepFun	xAI
Model family	—	grok-build
Accepted inputs	text	text, image, pdf
Produced outputs	text	text
Context window	256K	256K
Max output	256K	256K
Input price / 1M	$0.10Lower	$1.00
Output price / 1M	$0.30Lower	$2.00
Reasoning mode	Documented	Documented
Tool calling	Documented	Documented
Image input	Not documented	Documented
Audio input	Not documented	Not documented
Structured output	Not documented	Documented
License	Open weights	Proprietary

Step 3.5 Flash 2603 vs Grok Build 0.1

Step 3.5 Flash 2603

Grok Build 0.1

Key differences

Pricing, limits and capabilities

Which model should you choose?

Documentation and model profiles

Questions people ask

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