Question 1

What does this GPT-5.1 Chat vs Inkling Small 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: GPT-5.1 Chat or Inkling Small?

Accepted Answer

GPT-5.1 Chat lists $1.25 input and $10.00 output per 1M tokens. Inkling Small lists $0.50 input and $1.20 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: GPT-5.1 Chat or Inkling Small?

Accepted Answer

GPT-5.1 Chat lists 128K tokens and Inkling Small lists 1.05M. Inkling Small therefore has the larger recorded context window, but capacity alone is not a quality score.

Question 4

Which is faster: GPT-5.1 Chat or Inkling Small?

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 GPT-5.1 Chat and Inkling Small support?

Accepted Answer

GPT-5.1 Chat records text, image input and text output. Inkling Small records text, image, audio 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 GPT-5.1 Chat or Inkling Small?

Accepted Answer

Consider Inkling Small if you need larger context or larger maximum output or a lower listed input rate or a lower listed output rate. Inkling Small offers downloadable weights; GPT-5.1 Chat 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	GPT-5.1 Chat	Inkling Small
Provider	OpenAI	Thinkingmachines
Listed pricing route	OpenAI	Thinkingmachines
Model family	gpt-codex	ling
Accepted inputs	text, image	text, image, audio
Produced outputs	text	text
Context window	128K	1.05MHigher
Max output	16.38K	1.05MHigher
Input price / 1M	$1.25	$0.50Lower
Output price / 1M	$10.00	$1.20Lower
Reasoning mode	Documented	Documented
Tool calling	Documented	Documented
Image input	Documented	Documented
Audio input	Not documented	Documented
Structured output	Documented	Not documented
License	Proprietary	Apache-2.0

GPT-5.1 Chat vs Inkling Small

GPT-5.1 Chat

Inkling Small

Key differences

Pricing, limits and capabilities

Which model should you choose?

Documentation and model profiles

Questions people ask

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