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  5. OpenAI Codex MinivsQwen3.5 Plus 2026-04-20
Updated Apr 2026

OpenAI Codex MinivsQwen3.5 Plus 2026-04-20

Qwen3.5 Plus 2026-04-20 is cheaper than OpenAI Codex Mini at $0.4/M vs $1.5/M input tokens.

OpenAI Codex Mini and Qwen3.5 Plus 2026-04-20 compared across 9 shared prompts
SpecOpenAI Codex MiniQwen3.5 Plus 2026-04-20
Input price$1.5/M tokens$0.4/M tokens
Output price$6/M tokens$2.4/M tokens
Context window200K tokens1.0M tokens
Weights—Open
Free API (OpenRouter)NoNo
ReleasedMay 2025Apr 2026
Side by side

Same prompt, both answers

Opening lines from 2 of the 9 prompts both answered. Formatting stripped, words untouched.

Stochastic Consistency Test

Generate 5 jokes. How many are unique?

OpenAI Codex Mini75 words
Sure—here are five jokes: I asked the librarian if books about paranoia were available. She whispered, "They're right behind you." Why did the tomato turn red? Because it saw the salad dressing. I bought a boat because it was for sail. Don't trust stairs—they're always up to something.
Read the full answer
Qwen3.5 Plus 2026-04-20210 words
Here are 5 jokes: I asked my GPS to take me to a quiet place. It rerouted me to a library and whispered, “You’re already there.” My Wi-Fi and I had a fight. I told it I needed space. It said, “Fine,” and dropped the connection. I tried to start a band that only plays elevator music.
Read the full answer

Generate a Stand-Up Routine

Write a 3-minute stand-up comedy routine that isn't based on puns.

OpenAI Codex Mini595 words
[Comedian walks onstage] Hey, everyone! Great to see you all tonight. I'm Jamie—if you thought that intro was enthusiastic, you should've seen me when I realized this place has Wi-Fi. Seriously, though, I love stand-up.
Read the full answer
Qwen3.5 Plus 2026-04-20640 words
Title: The Unexpected Item Time: Approx. 3 Minutes Style: Observational / Storytelling Constraint Check: Zero puns used. (Comedian walks to the mic, adjusts the stand, looks at the audience.) How's everyone doing? You look good. You look like you've successfully navigated the self-checkout today. That's a win.
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Our Verdict
Qwen3.5 Plus 2026-04-20
Qwen3.5 Plus 2026-04-20
OpenAI Codex Mini
OpenAI Codex MiniRunner-up

Not enough votes to call it. On the specs, Qwen3.5 Plus 2026-04-20 has the edge: bigger model tier, newer, bigger context window.

Too close to call

Reviewing agent-written code?See a Brief PR report

API pricing

Cost per 1M tokens

OpenAI Codex Mini
Input
$1.50
Output
$6.00
Qwen3.5 Plus 2026-04-20
Input
$0.40
3.8× cheaper
Output
$2.40
2.5× cheaper

Qwen3.5 Plus 2026-04-20 is cheaper on both: 3.8× input, 2.5× output.

Where to run it

1 host

OpenAI Codex Mini

No hosts listed on OpenRouter.

Qwen3.5 Plus 2026-04-201 host
HostInOutContextUptime
Alibaba Cloud$0.30 in·$1.80 out·1M·100% up

Per million tokens. Prices and uptime via OpenRouter, checked 16 Sep 2026.

Research

What we learned reading every model

FAQ

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Same lab, same size, long tail

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Model pages

OpenAI Codex Mini logo
OpenAI Codex Mini10 outputs, specs and price
Qwen3.5 Plus 2026-04-20 logo
Qwen3.5 Plus 2026-04-2056 outputs, specs and price
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