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Grok 4 Fast (reasoning) vs Qwen3.8 Max Preview

Compare Grok 4 Fast (reasoning) from Grok and Qwen3.8 Max Preview from Qwen on key metrics including benchmarks, price, context length, and other model features. Access both models and hundreds of others through the AIHubMix API.

GrokGrok 4 Fast (reasoning)QwenQwen3.8 Max Preview
+ Add model · 2/4
Grok logo
Grok 4 Fast (reasoning)
Grok · text, image → text

Grok-4-fast is a cost-effective inference model developed by xAI that delivers cutting-edge performance with excellent token efficiency. The model features a 2 million token context window, advanced Web and X search capabilities, and a unified architecture supporting both "inference" and "non-inference" modes. Compared to Grok 4, it reduces thinking tokens by an average of 40% and lowers the price by 98% while achieving the same performance.

Input$0.2 /M
Output$0.5 /M
Cache read$0.05 /M
Details
Qwen logo
Qwen3.8 Max Preview
Qwen · text, image → text

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.

Input$0.338 /M
Output$1.014 /M
Cache read$0.0338 /M
Details

Pricing & Specifications

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

Grok 4 Fast (reasoning)
Qwen3.8 Max Preview
Input /M
$0.2
$0.338
Output /M
$0.5
$1.014
Cache read /M
$0.05
$0.0338
Context length
2,000,000
983,616
Max output
30,000
131,072
Time to First Token
2.7 s
2.4 s
Throughput
136.9 tok/s
48.1 tok/s
Modalities
textimage
textimage
Supported Parameters
thinkingtoolsfunction callingstructured outputs
toolsfunction callingstructured outputsweblong contextthinking
API Formats
Released
-
-

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.

grok-4-fast-reasoningqwen3.8-max-preview

Tokens / day

-

Requests / day

-

Performance Past 3 Days

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

grok-4-fast-reasoningqwen3.8-max-preview

Throughput (tok/s)

-

TTFT (s)

-

Uptime (%)

-

LMArena Benchmarks

LMArena ratings by capability (Bradley-Terry, commonly called Elo). Higher is better.

Text
grok-4-fast-reasoningqwen3.8-max-preview
1360142014801540
Overall
14041480
Coding
14371520
Math
14121497
Hard prompts
14131502
Instruction following
13881477
Multi-turn
14061493
Creative writing
13811466
Longer query
14121492
Chinese
14431536
English
14141488
WebDev Arena
grok-4-fast-reasoningqwen3.8-max-preview
11201280144016001760
Overall
11501670
React
16791679
HTML
11571628
Gaming
17351735
Simulations
16671667
Data analytics
16151615

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.

Grok 4 Fast (reasoning)
$19.50 /mo
Qwen3.8 Max Preview
$35.49 /mo

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

FAQ

Which is cheaper: Grok 4 Fast (reasoning), Qwen3.8 Max Preview?

Grok 4 Fast (reasoning): $0.5/M output tokens; Qwen3.8 Max Preview: $1.014/M. Use the cost calculator above to estimate your own workload.

How do their coding arena scores compare?

Qwen3.8 Max Preview: 1520; Grok 4 Fast (reasoning): 1437 (LMArena coding leaderboard).

Which responds faster?

Qwen3.8 Max Preview: 2.4s 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?

Grok 4 Fast (reasoning) accepts 2,000,000 and Qwen3.8 Max Preview accepts 983,616 input tokens. Maximum output per request is 30,000 tokens on Grok 4 Fast (reasoning) and 131,072 tokens on Qwen3.8 Max Preview.

Which one generates tokens faster?

Grok 4 Fast (reasoning) at 136.9 tok/s and Qwen3.8 Max Preview at 48.1 tok/s, measured as output throughput on AIHubMix — a separate metric from time to first token.

What inputs and capabilities does each model support?

Grok 4 Fast (reasoning) accepts text and image input and supports thinking, tool calling, function calling and structured outputs; Qwen3.8 Max Preview accepts text and image input and supports tool calling, function calling, structured outputs, web search, long context and thinking.

Can I call Grok 4 Fast (reasoning) and Qwen3.8 Max Preview 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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