Gemini 3.7 Flash vs Codex vs Claude Code (2026) — Compared
Three AI coding agents, used daily rather than skimmed off a spec sheet — with the one leaderboard result that disagrees with our own experience, stated plainly.
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- Claude Code is our pick day to day — but it does not lead the one independent benchmark we could find that includes all three.
- Codex scores higher on that benchmark than Claude Code does, and rides the same $20/mo ChatGPT plan most users already pay for.
- Gemini 3.7 Flash is the cheapest and fastest of the three (pure per-token pricing, no flat seat) and the one most likely to need a second pass to fix its own mistakes.
- None of the three has a finished score on this site yet — see why at the bottom, rather than a number we can't back up.
Editor's shortlist
Three options worth your shortlist — full reasoning continues below.
Top-rated for our day-to-day pick.
Check Claude CodeAffiliate link — we may earn a commission at no extra cost to you.
Top-rated for cheapest for light, occasional use.
Check Gemini 3.7 FlashAffiliate link — we may earn a commission at no extra cost to you.
Top picks compared (2026)
Pricing comparison not available for these products yet — we haven't independently verified current plans and prices for all of them. Check each provider's site for current pricing.
Top picks compared (2026)
| Product | Best for | Visit |
|---|---|---|
| Claude CodeBest Overall | Our day-to-day pick | Visit Claude Code |
| Codex (GPT-5.4) | Highest independent benchmark score | |
| Gemini 3.7 Flash | Cheapest for light, occasional use | Visit Gemini 3.7 Flash |
Links marked Visit are affiliate links — we may earn a commission at no extra cost to you. Rankings are decided by our scoring rubric, not commission rate. How we make money.
All three of these run inside a terminal or an editor rather than a chat window, and all three are built by a company that also sells a general assistant under the same brand. That is where the similarity ends. We used all three on real work, then went looking for an independent benchmark that includes all three on the same test — and found one, with a result that does not match our own ranking. We are printing both rather than picking the one that agrees with us.
The short version
Claude Code — the one we reach for
Claude Code rides on the same Claude Pro subscription most readers of this site already have for general chat — $20/mo, no separate purchase. It runs from a terminal, inside VS Code and JetBrains, in a browser, and from Slack and mobile, which is a genuinely wide spread of surfaces for one subscription.
The catch is in Anthropic's own pricing page, not ours: it describes the $20/mo Pro tier as fit for "short coding sprints in small codebases," and points anyone doing real day-to-day work at the $100/mo Max 5x or $200/mo Max 20x tiers instead. So the entry price is misleading for the use case Claude Code is actually good at.
"Claude Code to my opinion is the best."
Codex — the higher benchmark score, if you already pay for ChatGPT
Codex is included in ChatGPT Plus, Pro, Business and Enterprise at no extra charge, across the web, CLI, IDE extension and iOS, plus a cloud mode for background tasks. If you already pay for ChatGPT, this is a real capability added for free. If you don't, there's no way to buy Codex on its own without buying that plan.
What OpenAI does not publish is a hard number for how much you get at that price: Codex's rate limits are described only as "depending on the model used, size and complexity of your coding tasks," shared across a rolling 5-hour window plus a weekly cap, with extra usage sold as credits on top. And access itself has moved under users before — GPT-5.4 and GPT-5.4 mini access inside Codex ended for ChatGPT sign-ins on 31 Aug 2026, so whatever model you're evaluating today is not guaranteed to be the one you're using next month.
"Codex is smarter, but not the best."
Gemini 3.7 Flash — fast, cheap, and the one that made the most mistakes
Gemini 3.7 Flash is the default model across Google's Antigravity 2.0 IDE, its CLI and its SDK, and it's priced by the token rather than by the seat: $0.75 per million input tokens and $3.75 per million output tokens, introductory. That's genuinely cheaper than a flat $20/mo plan if your usage is light or occasional, and it's the only one of the three with no subscription minimum at all.
Google's own pricing page states the introductory rate ends 31 Dec 2026, after which input and output pricing double to $1.50 and $7.50 per million tokens. Budget for the higher number, not the launch number.
We could not find a dedicated feature or pricing page for the Antigravity surface itself — only a model-announcement blog post — so this is the thinnest documentation of the three products here, and we're saying so rather than papering over it with a longer features list than we can actually back up.
"Flash 3.7 is smart and fast but makes errors."
The benchmark that disagrees with us
SWE-bench Pro (Scale AI's real-world coding benchmark, checked 23 Sep 2026) is the closest thing to an independent, cross-vendor test that includes models from all three companies. On it, the top GPT-5.4 configuration ranks 2nd overall at 59.10, ahead of Claude Opus 4.6 (thinking) in 4th place at 51.90 — the model family behind Codex outscoring the one behind Claude Code, on this specific test.
Gemini 3.7 Flash itself isn't on that leaderboard yet; the closest listed entry, the prior-generation Gemini 3 Flash, ranks 14th at 34.63 — well behind both of the others, which lines up with what we saw first-hand. Google's own blog claims real gains for 3.7 Flash over its predecessor on two named benchmarks, DeepSWE v1.1 (65.3% vs 49.0%) and FrontierCode 1.1 (43.6% vs 34.4%) — worth knowing, but it's Google grading its own newer model against its own older one, not a comparison against Codex or Claude Code.
Both, for different questions. SWE-bench Pro scores the underlying model against a fixed set of curated tasks. Using Claude Code, Codex and Gemini 3.7 Flash for real work also means living with each tool's harness, its editing behaviour, how it handles a half-finished change, and how often you have to intervene — none of which a model-only leaderboard measures. We're not resolving the disagreement in either direction; we're telling you it exists.
Pricing side by side
| Product | How it's priced | Entry cost | What that entry tier is actually good for |
|---|---|---|---|
| Claude Code | Bundled into Claude Pro/Max | $20/mo (Pro) | Anthropic's own description: short sprints in small codebases only |
| Codex | Bundled into ChatGPT Plus/Pro/Business | $20/mo (Plus) | Unpublished usage cap, shared 5-hour + weekly window |
| Gemini 3.7 Flash | Per-token, no seat | $0.75/$3.75 per 1M tokens (input/output, intro) | Light or occasional use; rate doubles 31 Dec 2026 |
Final verdict
If you already pay for Claude Pro and expect to do real, ongoing coding work rather than the occasional short sprint, Claude Code is where we'd start — with the honest caveat that a real benchmark ranks Codex's underlying model ahead of it. If you're already inside ChatGPT and want to add coding without a second bill, Codex earns its place, as long as you accept that OpenAI hasn't told you exactly how much usage $20/mo actually buys. If your work is occasional and cost-sensitive, Gemini 3.7 Flash's per-token pricing is the cheapest way in — provided you plan to check its output, and you budget for the price doubling at the end of the year.
None of these three carries a finished score on this site as of 23 Sep 2026. Every product here has a scorecard against our published rubric with only the dimensions we could actually evidence filled in — pricing and named features from each vendor's own current pages, and a first pass at performance combining our own use with the one benchmark that covers all three. Usability and support are marked "not tested" because neither has been, yet, and we would rather say that than round up.
Frequently asked
Which of these is the best AI coding agent?+
In our own day-to-day use, Claude Code. A real independent benchmark, SWE-bench Pro, ranks Codex's underlying model ahead of Claude Code's on its specific tasks. We're printing both rather than picking the one that agrees with us.
Do I need a separate subscription for Codex or Claude Code?+
No — both are bundled into an existing plan you may already pay for: Codex into ChatGPT Plus/Pro/Business/Enterprise, Claude Code into Claude Pro or Max. Neither is sold as a standalone product.
Is Gemini 3.7 Flash cheaper than the other two?+
For light or occasional use, usually yes — it's priced per token rather than as a flat monthly seat. That introductory per-token rate is scheduled to double on 31 Dec 2026, per Google's own pricing page.
Why don't these three have a star rating on this site?+
Because we haven't finished evidencing them against our own scoring rubric. Each carries a scorecard with only the dimensions we could actually back up — pricing, named features, and an early read on performance. Usability and support are marked as not yet tested rather than guessed at.
Which of these picks is best overall?+
Claude Code is our top overall pick. The comparison above breaks down where each option wins.
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What's changed
Every meaningful edit to this article is logged here. Spotted something out of date? Submit a correction.
- Sep 23, 2026Article first published.
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Every review and comparison on this site is graded against the same five-factor rubric. Weights are fixed so two reviewers grading the same product land within ~0.5 of each other.
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Our verdict in four picks
The right choice depends on what you're optimizing for. Here's our shortlist by use case.
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ProductsVerdict Research Team
Research, comparisons & verdictsProductsVerdict Research Team leads ProductsVerdict's research on ai tools, evaluating live pricing, public benchmarks, vendor documentation and trial accounts to publish recommendations readers can actually act on. No paid placements, no pre-publication review by brands.
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