Gemini 3 Pro Preview vs o3 vs Claude Sonnet 4.5
Gemini 3 Pro Preview comes out ahead, 67 to 58 and 55 on our weighted score, though o3 is 22% cheaper per token.
- Our pick
GoogleGemini 3 Pro Preview
67/100- ECI153.0
- Price$2.00 / $12.00
- Context1.05M
OpenAIo3
58/100- ECI146.9
- Price$2.00 / $8.00
- Context200K
AnthropicClaude Sonnet 4.5
55/100- ECI146.8
- Price$3.00 / $15.00
- Context200K
Gemini 3 Pro Preview is our pick
Gemini 3 Pro Preview is the better all-round choice, scoring 67/100 against o3 (58) and Claude Sonnet 4.5 (55). It leads on capability, inputs & features and context window. o3 wins on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
- CapabilityGemini 3 Pro PreviewCapabilities Index (ECI): Gemini 3 Pro Preview 153.0 · o3 146.9 · Claude Sonnet 4.5 146.8
- Lowest priceo3o3 $3.50 · Gemini 3 Pro Preview $4.50 · Claude Sonnet 4.5 $6.00 per 1M tokens (3:1 blend)
- Longest contextGemini 3 Pro PreviewGemini 3 Pro Preview 1,048,576 · o3 200,000 · Claude Sonnet 4.5 200,000 tokens
- Widest inputsGemini 3 Pro PreviewGemini 3 Pro Preview: Text, Images, PDFs, Audio, Video · o3: Text, Images, PDFs · Claude Sonnet 4.5: Text, Images, PDFs
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | Gemini 3 Pro Preview | o3 | Claude Sonnet 4.5 |
|---|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 82 | 74 | 74 |
| Price | 25% | 19 | 24 | 13 |
| Inputs & features | 15% | 100 | 80 | 80 |
| Context window | 10% | 61 | 32 | 32 |
| Overall | 100% | 67/100 | 58/100 | 55/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Gemini 3 Pro PreviewGoogle | o3OpenAI | Claude Sonnet 4.5Anthropic |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 153.0 (best) | 146.9 | 146.8 |
| ECI rank | #39 of 148 (best) | #63 of 148 | #64 of 148 |
| GPQA DiamondGraduate-level science questions | 92.6% (best) | 81.8% | 82.3% |
| FrontierMath Tiers 1–3Research-level mathematics | — | 33.3% (best) | 23.9% |
| OTIS Mock AIME 2024–2025Competition mathematics | 91.4% (best) | 84.4% | 77.8% |
| SWE-bench VerifiedFixing real GitHub issues | 72.9% (best) | 62.3% | 71.3% |
| SimpleQA VerifiedShort factual questions | — | 49.4% (best) | 30.7% |
| Price per million tokens | |||
| Input | $2.00 (best) | $2.00 (best) | $3.00 |
| Output | $12.00 | $8.00 (best) | $15.00 |
| Cached input | — | $0.50 | $0.30 (best) |
| Blended (3:1) | $4.50 | $3.50 (best) | $6.00 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Median of 2 providers | Official OpenAI API | Official Anthropic API |
| Limits | |||
| Context window | 1,048,576 tokens (best) | 200,000 tokens | 200,000 tokens |
| Max output | 65,536 tokens | 100,000 tokens (best) | 64,000 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | Yes | Yes | Yes |
| Audio | Yes | No | No |
| Video | Yes | No | No |
| Reasoning | Yes | Yeslow · medium · high | Yes |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | Yes | Yes |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | — | o3 | claude-sonnet-4-5 |
| API providers | 3 | 18 | 28 (best) |
| Released | Nov 18, 2025 | Apr 16, 2025 | Sep 29, 2025 |
| Knowledge cutoff | Jan 2025 | May 2024 | Jul 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
- o3$36.00
- Claude Sonnet 4.5$60.00
Which should you choose?
Which is better: Gemini 3 Pro Preview, o3 or Claude Sonnet 4.5?
Gemini 3 Pro Preview is the better all-round choice, scoring 67/100 against o3 (58) and Claude Sonnet 4.5 (55). It leads on capability, inputs & features and context window. o3 wins on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
Which is cheaper, Gemini 3 Pro Preview, o3 or Claude Sonnet 4.5?
o3 is cheaper at $2.00 input / $8.00 output per million tokens (official OpenAI API price). Gemini 3 Pro Preview costs $2.00 input / $12.00 output per million tokens (median across 2 API providers); Claude Sonnet 4.5 costs $3.00 input / $15.00 output per million tokens (official Anthropic API price). At a typical mix of three input tokens to one output token, that is $3.50 per million tokens for o3 versus $4.50 for Gemini 3 Pro Preview (1.3× as much) and $6.00 for Claude Sonnet 4.5 (1.7× as much).
Which scores higher on benchmarks?
Gemini 3 Pro Preview scores higher on the Capabilities Index (ECI): Gemini 3 Pro Preview 153.0 (#39 of 148), o3 146.9 (#63 of 148) and Claude Sonnet 4.5 146.8 (#64 of 148). Their confidence ranges do not overlap (150.6–155.2 vs 144.9–148.6), so the gap is a real one. On individual benchmarks: GPQA Diamond — Gemini 3 Pro Preview 92.6%, Claude Sonnet 4.5 82.3%, o3 81.8%; OTIS Mock AIME 2024–2025 — Gemini 3 Pro Preview 91.4%, o3 84.4%, Claude Sonnet 4.5 77.8%; SWE-bench Verified — Gemini 3 Pro Preview 72.9%, Claude Sonnet 4.5 71.3%, o3 62.3%.
Which is better for coding?
Gemini 3 Pro Preview resolves more real GitHub issues on SWE-bench Verified: Gemini 3 Pro Preview 72.9%, Claude Sonnet 4.5 71.3% and o3 62.3%. 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 200,000 for o3 and 200,000 for Claude Sonnet 4.5. Maximum output per response: Gemini 3 Pro Preview up to 65,536, o3 up to 100,000, Claude Sonnet 4.5 up to 64,000 tokens.
Which can read images, PDFs, audio or video?
Gemini 3 Pro Preview accepts text, images, PDFs, audio and video; o3 accepts text, images and PDFs; Claude Sonnet 4.5 accepts text, images and PDFs. Gemini 3 Pro Preview handles the widest range of inputs.
Are any of these open source?
No. Gemini 3 Pro Preview, o3 and Claude Sonnet 4.5 are proprietary and only available through APIs and apps.
Which is newer?
Gemini 3 Pro Preview is the newest, released Nov 18, 2025. Claude Sonnet 4.5 came out Sep 29, 2025; o3 came out Apr 16, 2025. Knowledge cutoff: Gemini 3 Pro Preview Jan 2025, o3 May 2024, Claude Sonnet 4.5 Jul 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.
