Qwen3.5 4B is a low-cost multimodal reasoning model with 256K context, image and video input, function tools, and structured output.
Qwen3.5 4B by alibaba is offered by 2 providers on this page. Public prices are shown for 1 of them. Its reference price is $0.04 per 1M input tokens and $0.07 per 1M output tokens. It also has 1 free ($0) channel; free tiers usually carry rate limits, and subscription-covered access bills $0 per token only after the subscription fee.
Artificial Analysis rates it 13.1 on the Intelligence Index, with 22.6 for coding. Against its lowest blended price of $0.048 per 1M, that is roughly 276 index points per dollar, which is the value ratio the leaderboards rank on. Median output speed is 26 tokens per second, with 0.72s to the first token.
The context window is 262,144 tokens at the reference host, but hosts report different limits, from 32,768 to 262,144, so the usable window depends on the provider you pick. It supports reasoning, tool use, and structured output. Accepted input modalities are Text, Image, and Video. The weights are open, so it can also be self-hosted or served through a gateway of your choice. Providers report the capability flags inconsistently, so verify a specific feature against the host you plan to use.
Quality is independently evaluated by Artificial Analysis. Speed/latency are model-level medians.
| Provider | Tier | Input | Output | Cache read | Cache write | Context | Output limit | Status |
|---|---|---|---|---|---|---|---|---|
| QVAC qwen3.5-4b | Gateway | Free | — | — | 32,768 ⚠ | 8,192 | ||
| EmpirioLabs AI | Gateway | $0.04 | $0.07 | $0.02 | — | 262,144 | 32,768 |
Sorted by blended price (input×0.75 + output×0.25) asc. The official channel always shows regardless of rank. Whether a gateway's low price is actually usable can't be verified.
1 more channels offer $0 (QVAC); free tiers usually have rate limits and no SLA, excluded from ranking.
Price history accumulates from each data sync; currently only 1 sample(s) (2026-09-24). Each future sync adds a point, and once accumulated a line is drawn here.
Individual evaluations run by Artificial Analysis, on the same reasoning tier as the intelligence score above. Each benchmark has its own task set and harness, so rows are not comparable with one another. The Intelligence Index above draws on a different, newer set of evaluations.