Codex vs OpenCode — OpenCode vs Codex: 2 side-by-side tests
2 posts from X ran OpenAI Codex and OpenCode on the same task, between Oct 13, 2026 and Oct 21, 2026. Models: DeepSeek V4.1 Flash 1017, GPT-6 Luna, Claude Haiku 5.5, MiniMax M3.1 Flash, Gemini 4 Argon, Claude Opus 5.5, GPT-6 Astra. All harness comparisons.
- 1 post states a time for both: OpenAI Codex was faster in it, by ~45×.
- None keeps the model fixed: each side ran its own model, so harness and model effects are mixed — not a controlled comparison.
From 2 posts; costs and times as stated by each author, not a controlled benchmark.
Posts
2
Codex vs OpenCode, test by test
| Test | Codex: model | OpenCode: model | Time (Codex / OpenCode) | Author’s pick |
|---|---|---|---|---|
| GPU showcase website from given image assets, four models@VulKan42069 | GPT-6 Luna (Max) | MiniMax M3.1 Flash (Max) | 3.3 min / 2 h 28 min | — |
| 3D Lamborghini from code alone@akartit | GPT-6 Astra | Gemini 4 Argon | — | — |
Numbers are as each post states them; “—” means the post gives none. Tests and models differ from row to row.
Codex vs OpenCode pricing: plans
From each vendor’s official pricing page (checked 2026-10-19); prices exclude tax and can change. Usage limits differ by plan and model.
API list prices of the models in these tests
| Model | Used with | Input $/1M tokens | Output $/1M tokens |
|---|---|---|---|
| GPT-6 Luna | Codex | ||
| GPT-6 Astra | Codex | $10 | $50 |
| MiniMax M3.1 Flash | OpenCode | ||
| Gemini 4 Argon | OpenCode | $2introductory price through Nov 30, 2026; $4 after | $10introductory price through Nov 30, 2026; $20 after |
Official API list prices where verified; a blank cell has no verified official price in the archive (older or retired models).
What each test showed
In every test below each side ran its own model, so these are not controlled comparisons of the harnesses alone.
GPU showcase website from given image assets, four models — GPT-6 Luna (Max) in Codex vs MiniMax M3.1 Flash (Max) in OpenCode
DeepSeek V4.1 Flash 1017, GPT-6 Luna, Claude Haiku 5.5 and MiniMax M3.1 Flash, all on Max, each build a showcase website for the author’s graphics card from the same image assets. The post also includes DeepSeek Harness and Claude Code.
- DeepSeek Harness with DeepSeek V4.1 Flash 1017 at Max effort: time 34 min — Top left.
- OpenAI Codex with GPT-6 Luna at Max effort: time 3.3 min — Top right.
- Claude Code with Claude Haiku 5.5 at Max effort: time 36.3 min — Bottom left.
- OpenCode with MiniMax M3.1 Flash at Max effort: time 2 h 28 min — Bottom right; the author says it had the site done at about 34 min and kept fixing small things.
As stated: DeepSeek V4.1 Flash 1017 33 min 58 s; GPT-6 Luna 3 min 19 s; Claude Haiku 5.5 36 min 19 s; MiniMax M3.1 Flash 2 h 28 min.
Note: No winner named.
Posted Oct 21, 2026 by VulKan (@VulKan42069). Post on X · Video and details
3D Lamborghini from code alone — GPT-6 Astra in Codex vs Gemini 4 Argon in OpenCode
Three coding agents build a 3D Lamborghini from the same prompt, all in code with no 3D files: Gemini 4 Argon in OpenCode, Claude Opus 5.5 in Claude Code and GPT-6 Astra in Codex. The post also includes Claude Code.
- OpenCode with Gemini 4 Argon — 1 in the video.
- Claude Code with Claude Opus 5.5 — 2 in the video.
- OpenAI Codex with GPT-6 Astra — 3 in the video.
Posted Oct 13, 2026 by AK (@akartit). Post on X · Video and details
Codex vs OpenCode (OpenCode vs Codex): FAQ
Is Codex better than OpenCode?
None of the 2 posts names a winner between the two.
Which is faster, Codex or OpenCode?
OpenAI Codex, going by the posts' own numbers: it was faster in the one post that gives a time for each side (by ~45×). Times are as each author states them; models and settings differ.
Which is cheaper, Codex or OpenCode?
Codex plans (official pricing page, checked 2026-10-19): Free $0/month, Go $8/month, Plus $20/month, Pro From $100/month, Business $25/user/month, API key API pricing.
Which models were used with Codex and OpenCode?
With Codex: GPT-6 Luna, GPT-6 Astra. With OpenCode: MiniMax M3.1 Flash, Gemini 4 Argon.