75% off
Solar Pro4
Upstage · text → text
Input$0.3$0.075 /M
Output$1.2$0.3 /M
Cache read$0.06$0.015 /M
← ModelsSolar Pro4
Step 3.7 Flash
Solar Pro4 vs Step 3.7 Flash
Compare Solar Pro4 from Upstage 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.
Solar Pro4Step 3.7 Flash+ Add model · 2/4
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.
Solar Pro4
Step 3.7 Flash
Input /M
$0.3$0.075−75%
$0.22
Output /M
$1.2$0.3−75%
$1.32
Cache read /M
$0.06$0.015−75%
$0.044
Context length
524,288
256,000
Max output
0
0
Time to First Token
-
1.4 s
Throughput
-
32.6 tok/s
Modalities
text
textimagevideo
Supported Parameters
long context
API Formats
Released
August 6, 2026
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.
solar-pro4step-3.7-flash
Tokens / day
-
Requests / day
-
Performance Past 3 Days
Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.
solar-pro4step-3.7-flash
Throughput (tok/s)
-
TTFT (s)
-
Uptime (%)
-
Cost calculator
Estimate your monthly bill for the same workload on each model.
Solar Pro4
$36$9.00 /mo
Step 3.7 Flash
$33.00 /mo
Monthly = daily × 30. Discounted rates applied where a promotion is active.
FAQ
Which is cheaper: Solar Pro4, Step 3.7 Flash?
Solar Pro4: $0.3/M output tokens; Step 3.7 Flash: $1.32/M. Use the cost calculator above to estimate your own workload.
How large is each context window?
Solar Pro4 accepts 524,288 and Step 3.7 Flash accepts 256,000 input tokens.
What inputs and capabilities does each model support?
Solar Pro4 accepts text input and supports long context; Step 3.7 Flash accepts text, image and video input.
Can I call Solar Pro4 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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