Gemini 3 Pro Preview vs GPT-5.3 Chat
Gemini 3 Pro Preview comes out ahead, 52 to 32 on our weighted score, and it is the cheaper option too.
- Our pick
GoogleGemini 3 Pro Preview
52/100- ECI153.0
- Price$2.00 / $12.00
- Context1.05M
OpenAIGPT-5.3 Chat
32/100- ECI—
- Price$1.75 / $14.00
- Context128K
Add a model
Make it a three-way comparison.
Gemini 3 Pro Preview is our pick
Gemini 3 Pro Preview is the better all-round choice, scoring 52/100 against GPT-5.3 Chat (32). 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 priceGemini 3 Pro PreviewGemini 3 Pro Preview $4.50 · GPT-5.3 Chat $4.81 per 1M tokens (3:1 blend)
- Longest contextGemini 3 Pro PreviewGemini 3 Pro Preview 1,048,576 · GPT-5.3 Chat 128,000 tokens
- Widest inputsGemini 3 Pro PreviewGemini 3 Pro Preview: Text, Images, PDFs, Audio, Video · GPT-5.3 Chat: Text, Images
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | Gemini 3 Pro Preview | GPT-5.3 Chat |
|---|---|---|---|
| Price | 50% | 19 | 18 |
| Inputs & features | 30% | 100 | 60 |
| Context window | 20% | 61 | 24 |
| Overall | 100% | 52/100 | 32/100 |
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 3 Pro PreviewGoogle | GPT-5.3 ChatOpenAI |
|---|---|---|
| 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 | $2.00 | $1.75 (best) |
| Output | $12.00 (best) | $14.00 |
| Cached input | — | $0.175 |
| Blended (3:1) | $4.50 (best) | $4.81 |
| Long-context rate | Same rate | Same rate |
| Price source | Median of 2 providers | Official OpenAI API |
| Limits | ||
| Context window | 1,048,576 tokens (best) | 128,000 tokens |
| Max output | 65,536 tokens (best) | 16,384 tokens |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | Yes |
| PDFs | Yes | No |
| Audio | Yes | No |
| Video | Yes | No |
| Reasoning | Yes | No |
| Tool calling | Yes | Yes |
| Structured output | Yes | Yes |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | — | gpt-5.3-chat-latest |
| API providers | 3 | 4 (best) |
| Released | Nov 18, 2025 | Mar 3, 2026 |
| Knowledge cutoff | Jan 2025 | Aug 31, 2025 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Gemini 3 Pro Preview$44.00
- GPT-5.3 Chat$45.50
Which should you choose?
Which is better: Gemini 3 Pro Preview or GPT-5.3 Chat?
Gemini 3 Pro Preview is the better all-round choice, scoring 52/100 against GPT-5.3 Chat (32). 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, Gemini 3 Pro Preview or GPT-5.3 Chat?
Gemini 3 Pro Preview is cheaper at $2.00 input / $12.00 output per million tokens (median across 2 API providers). GPT-5.3 Chat costs $1.75 input / $14.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $4.50 per million tokens for Gemini 3 Pro Preview versus $4.81 for GPT-5.3 Chat (1.1× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. Gemini 3 Pro Preview has an ECI of 153.0 and GPT-5.3 Chat has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for GPT-5.3 Chat yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both 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 128,000 for GPT-5.3 Chat. Maximum output per response: Gemini 3 Pro Preview up to 65,536, GPT-5.3 Chat up to 16,384 tokens.
Which can read images, PDFs, audio or video?
Gemini 3 Pro Preview accepts text, images, PDFs, audio and video; GPT-5.3 Chat accepts text and images. Gemini 3 Pro Preview handles the widest range of inputs.
Are any of these open source?
No. Gemini 3 Pro Preview and GPT-5.3 Chat are proprietary and only available through APIs and apps.
Which is newer?
GPT-5.3 Chat is the newest, released Mar 3, 2026. Gemini 3 Pro Preview came out Nov 18, 2025. Knowledge cutoff: Gemini 3 Pro Preview Jan 2025, GPT-5.3 Chat Aug 31, 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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