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GPT 5.2 vs Step 3.7 Flash

Compare GPT 5.2 from OpenAI and Step 3.7 Flash from StepFun on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.

OpenAIGPT 5.2StepFunStep 3.7 Flash
+ Add model · 2/4
OpenAI logo
GPT 5.2
OpenAI · text, image, pdf → text

GPT-5.2 is an advanced general-purpose model that improves on GPT-5.1 with more reliable, flexible, and user-friendly interactions. It delivers clearer responses, stronger instruction-following, and adaptive reasoning that scales from simple requests to complex, multi-step tasks. With enhanced control over tone and structure and support for extended context, GPT-5.2 is well suited for agent workflows, analysis, coding, and cross-domain applications.

Input$1.75 /M
Output$14 /M
Cache read$0.175 /M
Details
StepFun logo
Step 3.7 Flash
StepFun · text, image, video → text

step-3.7-flash is stepfun's flagship inference model, designed for high-complexity tasks that require deep reasoning and fast execution. It excels at decomposing multi-step problems, performing tool calls, and maintaining consistency across massive datasets. It is the preferred choice for complex workloads such as long-context agents, advanced software engineering, and end-to-end research automation.

Input$0.22 /M
Output$1.32 /M
Cache read$0.044 /M
Details

Pricing & Specifications

Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.

GPT 5.2
Step 3.7 Flash
Input /M
$1.75
$0.22
Output /M
$14
$1.32
Cache read /M
$0.175
$0.044
Context length
400,000
256,000
Max output
128,000
0
Time to First Token
1.4 s
1.4 s
Throughput
58.1 tok/s
32.6 tok/s
Modalities
textimagepdf
textimagevideo
Supported Parameters
thinkingfunction callingstructured outputswebtools
API Formats
Released
December 11, 2025
May 29, 2026

Promotional prices show the discounted rate; see each model page for promotion windows.

Activity Past 30 Days

Daily traffic served through AIHubMix — how demand for each model is trending.

gpt-5.2step-3.7-flash

Tokens / day

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Requests / day

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Performance Past 3 Days

Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.

gpt-5.2step-3.7-flash

Throughput (tok/s)

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TTFT (s)

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Uptime (%)

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Cost calculator

Estimate your monthly bill for the same workload on each model.

Step 3.7 Flash
$33.00 /mo
GPT 5.2
$315 /mo

Monthly = daily × 30. Discounted rates applied where a promotion is active.

FAQ

Which is cheaper: GPT 5.2, Step 3.7 Flash?

Step 3.7 Flash: $1.32/M output tokens; GPT 5.2: $14/M. Use the cost calculator above to estimate your own workload.

Which responds faster?

GPT 5.2: 1.4s time to first token measured on AIHubMix; see the live performance charts above for how each model behaves across the day.

How large is each context window?

GPT 5.2 accepts 400,000 and Step 3.7 Flash accepts 256,000 input tokens.

Which one generates tokens faster?

GPT 5.2 at 58.1 tok/s and Step 3.7 Flash at 32.6 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.

What inputs and capabilities does each model support?

GPT 5.2 accepts text, image and PDF input and supports thinking, function calling, structured outputs, web search and tool calling; Step 3.7 Flash accepts text, image and video input.

Can I call GPT 5.2 and Step 3.7 Flash with the same API key?

Yes. AIHubMix serves every model on this page behind one OpenAI-compatible endpoint, so switching between them is a one-line change to the model field — no second account, key or SDK.

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