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A realistic comparison of Opus and Codex

2026-02-17 Science & Technology
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Theo - t3․gg
Theo - t3․gg
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Description

I've been using Opus 4.6 and Codex 5.3 every day for about a month now. They both have their strengths. They both have their weaknesses. Anthropic and OpenAI both made good models. Here's how I use both. Thank you Arcjet for sponsoring! Check them out at: https://soydev.link/arcjet Check out my Twitch, Twitter, Discord more at https://t3.gg S/O @Ph4seon3 for the awesome edit 🙏

Top Comments (10)

@nwsome 2026-02-17

$20 Codex gives you more usage than $100 Claude

468 41 replies
@jeonsiddart6433 2026-02-17

Best model counter counter: 9230

325 3 replies
@AlucardNoir 2026-02-17

I don't think you know what renaissance means theO.

253 14 replies
@MichaelCebrian 2026-02-17

BTW, if you ever run into the claude code "Error: Error during compaction: Error: Conversation too long." you can change model to `/model sonnet[1m]` and then `/compact` and then go back to opus. (or opus[1m] for the compaction if that works for your plan)

56 5 replies
@hank9th 2026-02-17

My current setup is "claude for planning, codex for real work". Claude tends to be really good when I want to refine a vague idea into an actionable plan, and codex is great when I want to go from an actionable plan to code.

48 5 replies
@FrancescoOddo_ 2026-02-17

Here we go, here for the fight

20
@RangaPrakashs 2026-02-17

Can’t wait for” My Robot is better than your Robot” comments in the future.

18 1 replies
@ryancloke4028 2026-02-17

It's Claude Code. I don't have most of those issues with Opus 4.6 in other harnesses

15
@7A7z 2026-02-17

22:24 he said it , he said it

9 1 replies
@slaikers 2026-02-17

"Not missing the details" is such a great way to describe Codex. Totally agree, it's really strongest at considering everything you've said, and not just randomly skimming over provided context and going off and doing it's own thing

8 2 replies

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