Models

GPT 4o vs Step 3.7 Flash

Compare GPT 4o 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 4oStepFunStep 3.7 Flash
OpenAI logo
GPT 4o
OpenAI · text, image, pdf → text

GPT-4o (“o” stands for “omni”) is a new-generation multimodal model designed for more natural human–computer interaction. It can accept any combination of text, audio, image, and video as input, and generate multimodal outputs including text, audio, and images. With audio response latency as low as 232 milliseconds on average around 320 milliseconds, it approaches real human conversational speed. The model delivers strong performance in English text and code, significantly improved multilingual understanding, and outstanding capabilities in visual and audio perception, while offering faster API performance and substantially reduced cost for real-time and complex multimodal applications.

Input$2.5 /M
Output$10 /M
Cache read$1.25 /M
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

Pricing & Specifications

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

GPT 4o
Step 3.7 Flash
Input /M
$2.5
$0.22
Output /M
$10
$1.32
Cache read /M
$1.25
$0.044
Context length
128,000
256,000
Max output
16,384
0
Time to First Token
0.6 s
1.4 s
Throughput
52.2 tok/s
32.6 tok/s
Modalities
textimagepdf
textimagevideo
Supported Parameters
toolsfunction callingstructured outputs
API Formats
Released
May 13, 2024
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-4ostep-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-4ostep-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 4o
$300 /mo

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

FAQ

Which is cheaper: GPT 4o, Step 3.7 Flash?

Step 3.7 Flash: $1.32/M output tokens; GPT 4o: $10/M. Use the cost calculator above to estimate your own workload.

Which responds faster?

GPT 4o: 0.6s 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 4o accepts 128,000 and Step 3.7 Flash accepts 256,000 input tokens.

Which one generates tokens faster?

GPT 4o at 52.2 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 4o accepts text, image and PDF input and supports tool calling, function calling and structured outputs; Step 3.7 Flash accepts text, image and video input.

Can I call GPT 4o 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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