Qwen 3.8 Max Preview(Qwen3.8-Max-Preview) is the latest-generation foundation model in the Qwen family, packing 2.4T parameters and still evolving. Compared with the previous flagship Qwen 3.7 Max, it delivers major gains in core capabilities like Coding and Cowork (professional productivity), with world-leading performance on complex, long-horizon tasks such as full-stack development, data analysis, and Office workflows. Launch offer: Credits are consumed at just 20% of the standard rate, effectively 5× your usage. Limited time only.
qwen3.8-max-preview vs step-3.5-flash
Output tokens cost $1.01 per million on qwen3.8-max-preview and $0.33 per million on step-3.5-flash. Input tokens cost $0.34 per million on qwen3.8-max-preview and $0.11 per million on step-3.5-flash. Cached input tokens are billed at $0.03 per million on qwen3.8-max-preview and $0.11 per million on step-3.5-flash. Context lengths are 983,616 tokens on qwen3.8-max-preview and 256,000 tokens on step-3.5-flash. On the LMArena coding leaderboard qwen3.8-max-preview scores 1528 and step-3.5-flash scores 1451.
step-3.5-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.
Pricing & Specifications
Prices are per million tokens. Time to First Token and throughput are rolling averages measured on AIHubMix.
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.
Tokens / day
Requests / day
Performance Past 3 Days
Measured on real AIHubMix traffic, hourly buckets. Gaps mean no traffic in that hour.
Throughput (tok/s)
TTFT (s)
Uptime (%)
LMArena Benchmarks
LMArena ratings by capability (Bradley-Terry, commonly called Elo). Higher is better.
Source: LMArena (arena.ai) leaderboard, imported by AIHubMix. Models without published ratings are omitted per chart.
Cost calculator
Estimate your monthly bill for the same workload on each model.
Monthly = daily × 30. Discounted rates applied where a promotion is active.
FAQ
Which is cheaper: qwen3.8-max-preview, step-3.5-flash?
step-3.5-flash: $0.33/M output tokens; qwen3.8-max-preview: $1.01/M. Use the cost calculator above to estimate your own workload.
How do their coding arena scores compare?
qwen3.8-max-preview: 1528; step-3.5-flash: 1451 (LMArena coding leaderboard).
How large is each context window?
qwen3.8-max-preview accepts 983,616 and step-3.5-flash accepts 256,000 input tokens.
What inputs and capabilities does each model support?
qwen3.8-max-preview accepts text and image input and supports tool calling, function calling, structured outputs, web search, long context and thinking; step-3.5-flash accepts text and image input.
Can I call qwen3.8-max-preview and step-3.5-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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