GPT-5-Codex vs Gemini 3 Pro Preview vs Gemini 2.5 Computer Use Preview
Gemini 3 Pro Preview comes out ahead, 52 to 42 and 35 on our weighted score, though GPT-5-Codex is 24% cheaper per token.
OpenAIGPT-5-Codex
42/100- ECI—
- Price$1.25 / $10.00
- Context400K
- Our pick
GoogleGemini 3 Pro Preview
52/100- ECI153.0
- Price$2.00 / $12.00
- Context1.05M
- Google
Gemini 2.5 Computer Use Preview
35/100- ECI—
- Price$1.25 / $10.00
- Context128K
Gemini 3 Pro Preview is our pick
Gemini 3 Pro Preview is the better all-round choice, scoring 52/100 against GPT-5-Codex (42) and Gemini 2.5 Computer Use Preview (35). It leads on inputs & features and context window. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest priceGPT-5-Codex and Gemini 2.5 Computer Use PreviewGPT-5-Codex $3.44 · Gemini 2.5 Computer Use Preview $3.44 · Gemini 3 Pro Preview $4.50 per 1M tokens (3:1 blend)
- Longest contextGemini 3 Pro PreviewGemini 3 Pro Preview 1,048,576 · GPT-5-Codex 400,000 · Gemini 2.5 Computer Use Preview 128,000 tokens
- Widest inputsGemini 3 Pro PreviewGPT-5-Codex: Text, Images · Gemini 3 Pro Preview: Text, Images, PDFs, Audio, Video · Gemini 2.5 Computer Use Preview: Text, Images
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | GPT-5-Codex | Gemini 3 Pro Preview | Gemini 2.5 Computer Use Preview |
|---|---|---|---|---|
| Price | 50% | 24 | 19 | 24 |
| Inputs & features | 30% | 70 | 100 | 60 |
| Context window | 20% | 44 | 61 | 24 |
| Overall | 100% | 42/100 | 52/100 | 35/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GPT-5-CodexOpenAI | Gemini 3 Pro PreviewGoogle | Gemini 2.5 Computer Use PreviewGoogle |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | 153.0 | — |
| ECI rank | — | #39 of 148 | — |
| GPQA DiamondGraduate-level science questions | — | 92.6% | — |
| OTIS Mock AIME 2024–2025Competition mathematics | — | 91.4% | — |
| SWE-bench VerifiedFixing real GitHub issues | — | 72.9% | — |
| Price per million tokens | |||
| Input | $1.25 (best) | $2.00 | $1.25 (best) |
| Output | $10.00 (best) | $12.00 | $10.00 (best) |
| Cached input | — | — | — |
| Blended (3:1) | $3.44 (best) | $4.50 | $3.44 (best) |
| Long-context rate | Same rate | Same rate | Over 200K: $2.50 / $15.00 |
| Price source | Median of 3 providers | Median of 2 providers | Official Google API |
| Limits | |||
| Context window | 400,000 tokens | 1,048,576 tokens (best) | 128,000 tokens |
| Max output | 128,000 tokens (best) | 65,536 tokens | 64,000 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | No | Yes | No |
| Audio | No | Yes | No |
| Video | No | Yes | No |
| Reasoning | Yes | Yes | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | Yes | No |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | — | — | gemini-2.5-computer-use-preview-10-2025 |
| API providers | 3 (best) | 3 (best) | 2 |
| Released | Sep 15, 2025 | Nov 18, 2025 | Oct 7, 2025 |
| Knowledge cutoff | Sep 30, 2024 | Jan 2025 | Jan 2025 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- GPT-5-Codex$32.50
- Gemini 3 Pro Preview$44.00
- Gemini 2.5 Computer Use Preview$32.50
Which should you choose?
Which is better: GPT-5-Codex, Gemini 3 Pro Preview or Gemini 2.5 Computer Use Preview?
Gemini 3 Pro Preview is the better all-round choice, scoring 52/100 against GPT-5-Codex (42) and Gemini 2.5 Computer Use Preview (35). It leads on inputs & features and context window. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, GPT-5-Codex, Gemini 3 Pro Preview or Gemini 2.5 Computer Use Preview?
GPT-5-Codex is cheaper at $1.25 input / $10.00 output per million tokens (median across 3 API providers). Gemini 2.5 Computer Use Preview costs $1.25 input / $10.00 output per million tokens (official Google API price); Gemini 3 Pro Preview costs $2.00 input / $12.00 output per million tokens (median across 2 API providers). At a typical mix of three input tokens to one output token, that is $3.44 per million tokens for GPT-5-Codex versus $3.44 for Gemini 2.5 Computer Use Preview (1× as much) and $4.50 for Gemini 3 Pro Preview (1.3× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. GPT-5-Codex has not been scored yet, Gemini 3 Pro Preview has an ECI of 153.0 and Gemini 2.5 Computer Use Preview has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for GPT-5-Codex and Gemini 2.5 Computer Use Preview yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. All three support tool calling for agent workflows.
Which has the bigger context window?
Gemini 3 Pro Preview has the largest context window at 1,048,576 tokens, against 400,000 for GPT-5-Codex and 128,000 for Gemini 2.5 Computer Use Preview. Maximum output per response: GPT-5-Codex up to 128,000, Gemini 3 Pro Preview up to 65,536, Gemini 2.5 Computer Use Preview up to 64,000 tokens.
Which can read images, PDFs, audio or video?
GPT-5-Codex accepts text and images; Gemini 3 Pro Preview accepts text, images, PDFs, audio and video; Gemini 2.5 Computer Use Preview accepts text and images. Gemini 3 Pro Preview handles the widest range of inputs.
Are any of these open source?
No. GPT-5-Codex, Gemini 3 Pro Preview and Gemini 2.5 Computer Use Preview are proprietary and only available through APIs and apps.
Which is newer?
Gemini 3 Pro Preview is the newest, released Nov 18, 2025. Gemini 2.5 Computer Use Preview came out Oct 7, 2025; GPT-5-Codex came out Sep 15, 2025. Knowledge cutoff: GPT-5-Codex Sep 30, 2024, Gemini 3 Pro Preview Jan 2025, Gemini 2.5 Computer Use Preview Jan 2025.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.
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