Gemini 2.5 Computer Use Preview vs GPT-5-Codex vs o3
Too close to call on our weighted score (o3 42, GPT-5-Codex 42, Gemini 2.5 Computer Use Preview 35). The right pick depends on what you value most.
GoogleGemini 2.5 Computer Use Preview
35/100- ECI—
- Price$1.25 / $10.00
- Context128K
OpenAIGPT-5-Codex
42/100- ECI—
- Price$1.25 / $10.00
- Context400K
- OpenAI
o3
42/100- ECI146.9
- Price$2.00 / $8.00
- Context200K
Too close to call
It is close. Our weighted score puts them within a point (o3 42/100, GPT-5-Codex 42/100, Gemini 2.5 Computer Use Preview 35/100), so choose by what matters most for your work: Gemini 2.5 Computer Use Preview on price and GPT-5-Codex for long inputs. 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 priceGemini 2.5 Computer Use Preview and GPT-5-CodexGemini 2.5 Computer Use Preview $3.44 · GPT-5-Codex $3.44 · o3 $3.50 per 1M tokens (3:1 blend)
- Longest contextGPT-5-CodexGPT-5-Codex 400,000 · o3 200,000 · Gemini 2.5 Computer Use Preview 128,000 tokens
- Widest inputso3Gemini 2.5 Computer Use Preview: Text, Images · GPT-5-Codex: Text, Images · o3: Text, Images, PDFs
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | Gemini 2.5 Computer Use Preview | GPT-5-Codex | o3 |
|---|---|---|---|---|
| Price | 50% | 24 | 24 | 24 |
| Inputs & features | 30% | 60 | 70 | 80 |
| Context window | 20% | 24 | 44 | 32 |
| Overall | 100% | 35/100 | 42/100 | 42/100 |
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 | Gemini 2.5 Computer Use PreviewGoogle | GPT-5-CodexOpenAI | o3OpenAI |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | 146.9 |
| ECI rank | — | — | #63 of 148 |
| GPQA DiamondGraduate-level science questions | — | — | 81.8% |
| FrontierMath Tiers 1–3Research-level mathematics | — | — | 33.3% |
| OTIS Mock AIME 2024–2025Competition mathematics | — | — | 84.4% |
| SWE-bench VerifiedFixing real GitHub issues | — | — | 62.3% |
| SimpleQA VerifiedShort factual questions | — | — | 49.4% |
| Price per million tokens | |||
| Input | $1.25 (best) | $1.25 (best) | $2.00 |
| Output | $10.00 | $10.00 | $8.00 (best) |
| Cached input | — | — | $0.50 |
| Blended (3:1) | $3.44 (best) | $3.44 (best) | $3.50 |
| Long-context rate | Over 200K: $2.50 / $15.00 | Same rate | Same rate |
| Price source | Official Google API | Median of 3 providers | Official OpenAI API |
| Limits | |||
| Context window | 128,000 tokens | 400,000 tokens (best) | 200,000 tokens |
| Max output | 64,000 tokens | 128,000 tokens (best) | 100,000 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | No | No | Yes |
| Audio | No | No | No |
| Video | No | No | No |
| Reasoning | Yes | Yes | Yeslow · medium · high |
| Tool calling | Yes | Yes | Yes |
| Structured output | No | Yes | Yes |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | gemini-2.5-computer-use-preview-10-2025 | — | o3 |
| API providers | 2 | 3 | 18 (best) |
| Released | Oct 7, 2025 | Sep 15, 2025 | Apr 16, 2025 |
| Knowledge cutoff | Jan 2025 | Sep 30, 2024 | May 2024 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Gemini 2.5 Computer Use Preview$32.50
- GPT-5-Codex$32.50
- o3$36.00
Which should you choose?
Which is better: Gemini 2.5 Computer Use Preview, GPT-5-Codex or o3?
It is close. Our weighted score puts them within a point (o3 42/100, GPT-5-Codex 42/100, Gemini 2.5 Computer Use Preview 35/100), so choose by what matters most for your work: Gemini 2.5 Computer Use Preview on price and GPT-5-Codex for long inputs. 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, Gemini 2.5 Computer Use Preview, GPT-5-Codex or o3?
Gemini 2.5 Computer Use Preview is cheaper at $1.25 input / $10.00 output per million tokens (official Google API price). GPT-5-Codex costs $1.25 input / $10.00 output per million tokens (median across 3 API providers); o3 costs $2.00 input / $8.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $3.44 per million tokens for Gemini 2.5 Computer Use Preview versus $3.44 for GPT-5-Codex (1× as much) and $3.50 for o3 (1× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Gemini 2.5 Computer Use Preview has not been scored yet, GPT-5-Codex has not been scored yet and o3 has an ECI of 146.9.
Which is better for coding?
There are no published SWE-bench Verified results for Gemini 2.5 Computer Use Preview and GPT-5-Codex 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?
GPT-5-Codex has the largest context window at 400,000 tokens, against 200,000 for o3 and 128,000 for Gemini 2.5 Computer Use Preview. Maximum output per response: Gemini 2.5 Computer Use Preview up to 64,000, GPT-5-Codex up to 128,000, o3 up to 100,000 tokens.
Which can read images, PDFs, audio or video?
Gemini 2.5 Computer Use Preview accepts text and images; GPT-5-Codex accepts text and images; o3 accepts text, images and PDFs. o3 handles the widest range of inputs.
Are any of these open source?
No. Gemini 2.5 Computer Use Preview, GPT-5-Codex and o3 are proprietary and only available through APIs and apps.
Which is newer?
Gemini 2.5 Computer Use Preview is the newest, released Oct 7, 2025. GPT-5-Codex came out Sep 15, 2025; o3 came out Apr 16, 2025. Knowledge cutoff: Gemini 2.5 Computer Use Preview Jan 2025, GPT-5-Codex Sep 30, 2024, o3 May 2024.
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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