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qwen3.5-4bRunware Inc.

in /1M$0.05input tokens
out /1M$0.07output tokens
context262K262K out
trainingnoon your prompts
api
chat
hosting
UK
model lab
Qwen
weights
open
added
March 2026
model id
runware/qwen3.5-4b

capabilities 4/8

visionreasoningtoolscachingweb searchjson schemacomputer useimage gen

pricing

no markup
input
$0.05
output
$0.07
cache write
-
cache read
$0.0050

worked cost

Estimated cost for three request volumes
volumecost
100K in + 10K out$0.0057
1M in + 100K out$0.0570
10M in + 1M out$0.57

Requesty charges what the upstream provider charges, with no markup and no per-request fee. Prompt caching and smart routing cut the effective cost further on repeated context. Gateway pricing

provider price, passed throughper 1M tokens

measured

through Sep 12

no measured traffic for this endpoint yet. pricing above is the provider's own

benchmarks

artificial analysis
Benchmark scores, each normalised to 100
evalScore as a share of 100/100
τ²-Bench92.1
GPQA Diamond77.1
Coding Index22.6
Terminal-Bench Hard18.2
Intelligence Index13.1
Humanity's Last Exam9.9
6 evalsmean38.8

Scores from Artificial Analysis and public leaderboards, normalised to 100. Bar colour is the band, not the rank: green 80 and up, blue 55 and up, amber 30 and up. Benchmarks measure narrow skills, so test on your own workload before committing. Released 2026-03-02.

policy

data terms
retention
none
trains on prompts
no
hosted in
UK

Terms are the provider's, not Requesty's: routing a request here puts it under them. Runware Privacy Policy

Need every request to stay in one jurisdiction? EU hosting routes only through EU-hosted providers.

quickstart

openai compatible
runware/qwen3.5-4b

this id pins the runware inc. deployment, with no routing and no failover. the managed id on the canonical page routes across all 1 providers instead

main.py
from openai import OpenAI client = OpenAI(    api_key="YOUR_REQUESTY_API_KEY",    base_url="https://router.requesty.ai/v1",) response = client.chat.completions.create(    model="runware/qwen3.5-4b",    messages=[        {"role": "user", "content": "Explain quantum computing in one paragraph."},    ],) print(response.choices[0].message.content)

Change the base url to https://router.requesty.ai/v1, use your Requesty key, set the model to the id above. Existing OpenAI SDK code needs no other edit, and the same key reaches every other model in the catalog. Browse all models

notes

reference

Qwen3.5 4B is a lightweight hybrid-reasoning model from the Qwen3.5 family, optimized for high-throughput, cost-sensitive workloads with a 262K token context window, tool calling, and structured output support. Served via Runware.

questions 6

How much does qwen3.5-4b cost?
qwen3.5-4b is priced at $0.05 per million input tokens and $0.07 per million output tokens when accessed via Requesty. Prompt caching is supported, which can cut effective input cost by up to 90% on repeated context. Requesty charges exactly what the upstream provider charges, we don't add markup.
What is the context window of qwen3.5-4b?
qwen3.5-4b has a context window of 262K tokens, with a maximum output of 262K tokens per response. That is roughly 350 words of input you can fit in a single prompt.
How does qwen3.5-4b perform on benchmarks?
qwen3.5-4b scores 92.1% on τ²-Bench, 77.1% on GPQA Diamond, 22.6% on Coding Index. The benchmarks pane shows every published result, each normalised to 100.
What can qwen3.5-4b do?
qwen3.5-4b supports vision input, tool calling, extended reasoning, prompt caching. You can call it through any OpenAI-compatible client by pointing base_url to Requesty.
How do I use qwen3.5-4b with the OpenAI SDK?
Install the OpenAI SDK, set base_url to "https://router.requesty.ai/v1", set your API key to your Requesty key, and set the model to "runware/qwen3.5-4b". The quickstart pane shows Python, JavaScript and cURL snippets.
Can I run qwen3.5-4b through Requesty?
Yes. qwen3.5-4b runs through Requesty's OpenAI-compatible API, served from Runware Inc.. You do not host the model yourself: point base_url at Requesty, set the model to "runware/qwen3.5-4b", and requests are routed to the upstream provider with automatic failover. The same key gives you 600+ other models too.

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call qwen3.5-4b through one endpoint

One key for this endpoint and 600+ other models. No markup on provider prices, automatic failover when a provider degrades, and prompt caching built in. Methodology

qwen3.5-4brunware inc.in $0.05 /1Mout $0.07 /1Mctx 262Khosted UK