Coding AI comparison · 2026
Gemini 3.7 Flash vs OpenAI Codex (2026 Comparison)
Side-by-side: pricing, features, pros, cons, and our editorial winner for coding ai.
Winner summary
Gemini 3.7 Flash vs OpenAI Codex: how they differ
We have not scored Gemini 3.7 Flash against our rubric yet, so we are not naming an overall winner here. The dimensions below are still directly comparable.
Cheaper
Not compared
Higher rated
Not compared
Better free tier
Tie
Gemini 3.7 Flash
Google's fast Gemini model, running coding agents in Antigravity
Not yet scored
$0.75 / 1M input tokens
OpenAI Codex
OpenAI's coding agent, bundled into ChatGPT
Not yet scored
$20/mo
Feature comparison
| Dimension | Gemini 3.7 Flash | OpenAI Codex |
|---|---|---|
| Starting price | $0.75 / 1M input tokens | $20/mo |
| Free trial | Free tier in Google AI Studio | Free in ChatGPT Free/Go (limited time) |
| Best for | Fast, cheap coding tasks where occasional errors are tolerable | Developers already paying for ChatGPT |
| Badge | — | — |
Gemini 3.7 Flash key features
- Default model across Google's Antigravity 2.0 IDE, CLI and SDK surfaces
- Metered per-token pricing rather than a flat subscription
- Google-reported gains over the prior 3.6 Flash on named coding benchmarks (DeepSWE v1.1, FrontierCode 1.1)
OpenAI Codex key features
- Runs on the web, CLI, IDE extension and iOS
- Cloud-based background tasks
- Rides the existing ChatGPT Plus/Pro/Business/Enterprise seat — no separate subscription
- 5-hour plus weekly rate-limit windows shared between local and cloud runs
- Extra usage credits purchasable without upgrading plan
Gemini 3.7 Flash — pros & cons
Pros
- Metered pricing can be cheaper than a flat $20/mo seat for light use
- Fast — matches Julian's own experience
Cons
- Julian's own use: "makes errors"
- Intro pricing ($0.75/$3.75 per 1M input/output tokens) doubles to $1.50/$7.50 on 31 Dec 2026
- No dedicated feature/pricing page for the Antigravity surface itself was found — thinner documentation than Codex or Claude Code
OpenAI Codex — pros & cons
Pros
- No separate subscription if you already pay for ChatGPT
- Works across CLI, IDE and mobile
Cons
- Rate limits are usage-based and not published as hard numbers
- Model access changed under users — GPT-5.4/5.4 mini access was removed from Codex sign-in on 31 Aug 2026
When to pick which
Choose Gemini 3.7 Flash if…
- High-volume, low-stakes coding tasks
- Cost-sensitive agent workloads
Choose OpenAI Codex if…
- Feature development
- Codebase-wide refactors
- Background cloud coding tasks