Models

Claude 3.5 Sonnet vs Step 3.7 Flash

Compare Claude 3.5 Sonnet from Anthropic 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.

AnthropicClaude 3.5 SonnetStepFunStep 3.7 Flash
Anthropic logo
Claude 3.5 Sonnet
Anthropic · text, image → text

Claude 3.5 Sonnet delivers performance superior to Opus and speeds faster than its predecessor, all at the same price point. Its core strengths include: Coding: Autonomously writes, edits, and executes code with advanced reasoning and troubleshooting. Data Science: Augments human expertise by analyzing unstructured data and using multiple tools to generate insights. Visual Processing: Excels at interpreting charts, graphs, and images, accurately transcribing text to derive high-level insights. Agentic Tasks: Exceptional tool use makes it highly effective for complex, multi-step agentic workflows that interact with other systems.

Input$3.3 /M
Output$16.5 /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.

Claude 3.5 Sonnet
Step 3.7 Flash
Input /M
$3.3
$0.22
Output /M
$16.5
$1.32
Cache read /M
-
$0.044
Context length
200,000
256,000
Max output
8,192
0
Time to First Token
0.6 s
1.4 s
Throughput
57.2 tok/s
32.6 tok/s
Modalities
textimage
textimagevideo
Supported Parameters
toolsfunction callingstructured outputs
API Formats
Released
-
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.

claude-3-5-sonnetstep-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.

claude-3-5-sonnetstep-3.7-flash

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

-

Cost calculator

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

Step 3.7 Flash
$33.00 /mo
Claude 3.5 Sonnet
$446 /mo

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

FAQ

Which is cheaper: Claude 3.5 Sonnet, Step 3.7 Flash?

Step 3.7 Flash: $1.32/M output tokens; Claude 3.5 Sonnet: $16.5/M. Use the cost calculator above to estimate your own workload.

Which responds faster?

Claude 3.5 Sonnet: 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?

Claude 3.5 Sonnet accepts 200,000 and Step 3.7 Flash accepts 256,000 input tokens.

Which one generates tokens faster?

Claude 3.5 Sonnet at 57.2 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?

Claude 3.5 Sonnet accepts text and image input and supports tool calling, function calling and structured outputs; Step 3.7 Flash accepts text, image and video input.

Can I call Claude 3.5 Sonnet 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.

Popular comparisons

Related model match-ups readers also look at.