Codex (OpenAI)
Free tier available
- API -- gpt-6.1-sol (2026-09-29)$2/$10/per 1M tokens; cached input $0.10 (GPT-6 Sol: $0.20)
- Free$0
- Go$8/mo
Our pickA
8.3/10Codex (OpenAI)
GPT-6.1 Sol (added 2026-09-29 for Plus and up, rolling out from Pro; Ultrafast variant coming) + GPT-6 Sol + GPT-6 Luna (2026-09-22; Luna for Free/Go in the desktop app) + GPT-6 Astra (Ultrafast tier on Pro 500/Enterprise) alongside GPT-5.6 Sol / Terra / Luna (GA 2026-07-09; Terra default on Free/Go). GPT-5.5 remains selectable as previous-gen; GPT-5.4 retired from Codex 2026-08-31; GPT-5.2-Codex retired 2026-07-23; gpt-5.3-codex leaves the API 2027-04-01
VS
A
8.0/10Google Antigravity
Gemini 3.5 Flash / Gemini 3.1 Pro / Claude Opus 4.6 / GPT-OSS 120B (multi-model). Gemini 3.5 Flash added at I/O 2026 (2026-05-19) and is the model behind the antigravity-preview-05-2026 Managed Agent.
Codex (OpenAI) vs Google Antigravity
Tier-list head-to-head. Codex (OpenAI) takes the A-tier slot — here's the breakdown.
Last reviewed October 15, 2026· sweep-fresh
Spec sheet
At a glance
| Codex (OpenAI) | Google Antigravity | |
|---|---|---|
| Tier | A-tierwin | A-tier |
| Overall score | 8.3 / 10win | 8.0 / 10 |
| Powered by | GPT-6.1 Sol (added 2026-09-29 for Plus and up, rolling out from Pro; Ultrafast variant coming) + GPT-6 Sol + GPT-6 Luna (2026-09-22; Luna for Free/Go in the desktop app) + GPT-6 Astra (Ultrafast tier on Pro 500/Enterprise) alongside GPT-5.6 Sol / Terra / Luna (GA 2026-07-09; Terra default on Free/Go). GPT-5.5 remains selectable as previous-gen; GPT-5.4 retired from Codex 2026-08-31; GPT-5.2-Codex retired 2026-07-23; gpt-5.3-codex leaves the API 2027-04-01 | Gemini 3.5 Flash / Gemini 3.1 Pro / Claude Opus 4.6 / GPT-OSS 120B (multi-model). Gemini 3.5 Flash added at I/O 2026 (2026-05-19) and is the model behind the antigravity-preview-05-2026 Managed Agent. |
| Free tier | Yes | Yes |
| Starting price | $2/$10 | $0 |
| Best for | Developers already paying for ChatGPT Plus who want a coding agent at no extra cost. | Developers working on large, multi-file projects who want to parallelize their workflow. |
| Last reviewed | 2026-10-12 | 2026-10-15 |
Head-to-head
Score showdown
Rated 1-10 on the same rubric across all 130 tools we cover.
Ease of useTie
Codex (OpenAI)
8.0
Google Antigravity
8.0
Output quality+0.5 Google Antigravity
Codex (OpenAI)
8.0
Google Antigravity
8.5
Value+2.0 Codex (OpenAI)
Codex (OpenAI)
8.0
Google Antigravity
6.0
Features+0.5 Google Antigravity
Codex (OpenAI)
9.0
Google Antigravity
9.5
Overall+0.3 Codex (OpenAI)
Codex (OpenAI)
8.3
Google Antigravity
8.0
What you'll pay
Pricing snapshot
Look past the headline number -- entry-tier limits drive most cost surprises.
Google Antigravity
Free tier available
- Free$0
- Pro$20/mo
- Ultra$249.99/mo
Benchmark Head-to-Head
GPT-5.2-Codex (HISTORICAL -- this model was RETIRED 2026-07-23; scores retained for trend context only). GPT-6 Sol and Luna joined Codex 2026-09-22: OpenAI reports DeepSWE v1.1 68.8% (Sol, max effort) and 66.6% (Luna, max) -- first-party, third-party verification pending; see Known Issues benchmarks — Google Antigravity has no published benchmarks
| Benchmark | Description | Score |
|---|---|---|
| SWE-bench | Real GitHub issue fixing | 72% |
| HumanEval | Python code generation | 95% |
The decision
Which should you pick?
Use-case anchors and category strengths, side by side.
Pick Codex (OpenAI)if…
A
8.3/10- ✓Better value at the price you'll actually pay (8.0/10 on value)
- ✓Developers already paying for ChatGPT Plus who want a coding agent at no extra cost.
- ✓Especially good for parallel task execution -- assign multiple bug fixes or feature branches and let Codex work them simultaneously.
Developers already paying for ChatGPT Plus who want a coding agent at no extra cost. Especially good for parallel task execution -- assign multiple bug fixes or feature branches and let Codex work them simultaneously.
Visit Codex (OpenAI)Pick Google Antigravityif…
A
8.0/10- ✓Developers working on large, multi-file projects who want to parallelize their workflow.
- ✓If you regularly work on 3-5 tasks simultaneously (fix a bug, add a feature, write tests, refactor), Antigravity's multi-agent architecture is unmatched.
Developers working on large, multi-file projects who want to parallelize their workflow. If you regularly work on 3-5 tasks simultaneously (fix a bug, add a feature, write tests, refactor), Antigravity's multi-agent architecture is unmatched.
Visit Google AntigravityBottom line
The verdict
Codex (OpenAI) edges out Google Antigravity by 0.3 points (8.3 vs 8.0) -- a A-tier vs A-tier split that's narrow but real. Not a blowout; both belong on a shortlist. The score gap shows up most clearly in the categories that matter for Codex (OpenAI)'s strengths, so if those categories are your priority, the lead translates.
Pricing-wise, both tools have a free tier (Codex (OpenAI) starts $2/$10, Google Antigravity starts $0), so you can test either without committing. Compare what each free tier actually unlocks -- usage caps, model access, and feature gates differ a lot more than the headline price suggests, especially as both vendors have tightened limits in 2026.
By use case: pick Codex (OpenAI) when developers already paying for chatgpt plus who want a coding agent at no extra cost. Pick Google Antigravity when developers working on large, multi-file projects who want to parallelize their workflow. The two tools aren't fighting for the same person -- they're aiming at adjacent jobs that occasionally overlap. If you're squarely in Codex (OpenAI)'s lane, the tier-list ranking and the use-case fit point the same direction; if you're in Google Antigravity's lane, the score gap matters less than the fit.
Bottom line: Codex (OpenAI) is the safer default for most readers, but Google Antigravity is competitive enough that the tie-breaker is your specific workload, not the spec sheet.
Keep digging
Compare more & explore
Full Codex (OpenAI) review
Tier A · 8.3/10
Full Google Antigravity review
Tier A · 8.0/10
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Built from our daily AI-tool sweep, last touched October 15, 2026. Honest tier-list reviews — no affiliate-link pieces disguised as advice. See the rubric or how we review.