Question 1

What does this GPT-Realtime-2.1 vs Fugu 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-Realtime-2.1 or Fugu?

Accepted Answer

The available pricing does not establish a comparable input and output token rate for both models. Check the billing unit and selected host in each profile. Images, speech, video and local inference can have different cost structures.

Question 3

Which has the larger context window: GPT-Realtime-2.1 or Fugu?

Accepted Answer

GPT-Realtime-2.1 lists 128K tokens and Fugu lists 1M. Fugu therefore has the larger recorded context window, but capacity alone is not a quality score.

Question 4

Which is faster: GPT-Realtime-2.1 or Fugu?

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-Realtime-2.1 and Fugu support?

Accepted Answer

GPT-Realtime-2.1 records text, audio, image input and text, audio output. Fugu records text, image 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-Realtime-2.1 or Fugu?

Accepted Answer

Consider Fugu if you need larger context. 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-Realtime-2.1	Fugu
Provider	OpenAI	Sakana AI
Listed pricing route	OpenAI	Sakana AI
Model family	gpt	fugu
Accepted inputs	text, audio, image	text, image
Produced outputs	text, audio	text
Context window	128K	1MHigher
Max output	32K	—
Input price / 1M	$4.00	—
Output price / 1M	$24.00	—
Reasoning mode	Documented	Documented
Tool calling	Documented	Documented
Image input	Documented	Documented
Audio input	Documented	Not documented
Structured output	Not documented	Documented
License	Proprietary	Proprietary

GPT-Realtime-2.1 vs Fugu

GPT-Realtime-2.1

Fugu

Key differences

Pricing, limits and capabilities

Which model should you choose?

Documentation and model profiles

Questions people ask

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