Question 1

What is Qwen3.5 Plus?

Accepted Answer

Qwen3.5 Plus is a model from Qwen, released on Feb 16, 2026. Qwen3.5 Plus (April 2026) is a large-scale multimodal language model from Alibaba. It accepts text, image, and video input and produces text output, with a 1M token context window. This is an updated version of Qwen3.5 Plus with tiered pricing above 256K tokens.

Question 2

How much does Qwen3.5 Plus cost?

Accepted Answer

On the Respan gateway, input starts at $0.26 per 1M tokens on OpenRouter, and output starts at $1.56 per 1M tokens on OpenRouter, after gateway discounts. Averaged across 4 providers, it costs $0.32 per 1M input tokens and $1.93 per 1M output tokens.

Question 3

Which providers serve Qwen3.5 Plus on Respan?

Accepted Answer

4 providers serve Qwen3.5 Plus: OpenRouter, EmpirioLabs, and Novita.

Question 4

What is Qwen3.5 Plus's context window?

Accepted Answer

Qwen3.5 Plus accepts up to 1M tokens of context on its largest provider route.

Question 5

How do I use Qwen3.5 Plus with the Respan gateway?

Accepted Answer

Point any OpenAI-compatible SDK at https://api.respan.ai/api/ with your Respan API key and set the model to "qwen3.5-plus". To set it up with a coding agent, copy the agent setup prompt at the top of this page.

Question 6

How fast is Qwen3.5 Plus?

Accepted Answer

Over the last 30 days of requests through the Respan gateway, the fastest provider was OpenRouter at 31 tokens per second, and the lowest response latency was 2.2 seconds on OpenRouter. Speed varies with request size and provider.

Question 7

Where does Qwen3.5 Plus rank on the Respan Index?

Accepted Answer

Qwen3.5 Plus scores 20.0 out of 100 on the Respan Index v1.1, ranking #96 of 138 models. By category: Coding 10.0 (estimated), Agents 6.0, Reasoning 24.9, Knowledge & language 25.4, and Human preference 48.1 (estimated). The Respan Index combines independent and lab-reported benchmark results into one score, using benchmark data collected by llmmetric.com.

Question 8

How does Qwen3.5 Plus score on benchmarks?

Accepted Answer

Qwen3.5 Plus has 8 published benchmark scores, including Vending-Bench 2 0.54, GPQA Diamond 84.8%, and OTIS Mock AIME 2024-2025 86.7%. Each score links to where it was published; the data is collected by llmmetric.com.

Provider	Context	Input	Output
OpenRouter`openrouter/qwen/qwen3.5-plus-02-15`	1M	$0.26/M	$1.56/M
OpenRouter`openrouter/qwen/qwen3.5-plus-20260420`	1M	$0.30/M	$1.80/M
EmpirioLabs`empiriolabs/qwen3-5-plus`	1M	$0.36/M	$2.21/M
NovitaSave 10%`novita/qwen/qwen3.5-plus`	1M	$0.36/M	$2.16/M

Qwen3.5 Plus

Providers

Certified where it counts.

Pricing

Cost by volume

Throughput and latency

Output speed

Response latency

Benchmarks

Respan Indexv1.1

Agents1

Reasoning3

Apps

Qwen3.5 Plus FAQ

Works with your entire stack

Built for AI agents.
Break less.
Ship more.

Math1

Knowledge2

Other1