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Claude Opus 4.6 vs Step 3.7 Flash

Compare Claude Opus 4.6 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 Opus 4.6StepFunStep 3.7 Flash
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Anthropic logo
Claude Opus 4.6
Anthropic · text, image, pdf → text

Claude Opus 4.6 is Anthropic’s latest state-of-the-art reasoning model. It features an adaptive “thinking” mode that dynamically decides when to think and how much to think. At the default effort level (high), Claude will almost always engage in thinking. At lower effort levels, it may skip thinking for simple problems. ⚠️ The minimum cache token for claude-opus-4-6 has been increased from 1,024 to 4,096 tokens.

Input$5 /M
Output$25 /M
Cache read$0.5 /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.

Claude Opus 4.6
Step 3.7 Flash
Input /M
$5
$0.22
Output /M
$25
$1.32
Cache read /M
$0.5
$0.044
Context length
1,000,000
256,000
Max output
128,000
0
Time to First Token
1.2 s
1.4 s
Throughput
59.8 tok/s
32.6 tok/s
Modalities
textimagepdf
textimagevideo
Supported Parameters
thinkingtoolsfunction callingstructured outputs
API Formats
Released
February 5, 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.

claude-opus-4-6step-3.7-flash

Tokens / day

-

Requests / day

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Performance Past 3 Days

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

claude-opus-4-6step-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
Claude Opus 4.6
$675 /mo

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

FAQ

Which is cheaper: Claude Opus 4.6, Step 3.7 Flash?

Step 3.7 Flash: $1.32/M output tokens; Claude Opus 4.6: $25/M. Use the cost calculator above to estimate your own workload.

Which responds faster?

Claude Opus 4.6: 1.2s 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 Opus 4.6 accepts 1,000,000 and Step 3.7 Flash accepts 256,000 input tokens.

Which one generates tokens faster?

Claude Opus 4.6 at 59.8 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 Opus 4.6 accepts text, image and PDF input and supports thinking, tool calling, function calling and structured outputs; Step 3.7 Flash accepts text, image and video input.

Can I call Claude Opus 4.6 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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