Gemini 3 Pro vs GPT-5.4
Gemini 3 Pro (2025) and GPT-5.4 (2026) are frontier reasoning models from Google DeepMind and OpenAI. Gemini 3 Pro ships a 1m-token context window, while GPT-5.4 ships a 1.05m-token context window. On MMLU PRO, Gemini 3 Pro leads by 4.3 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
GPT-5.4 is safer overall; choose Gemini 3 Pro when coding workflow support matters.
Decision scorecard
Local evidence first| Signal | Gemini 3 Pro | GPT-5.4 |
|---|---|---|
| Best for | multimodal apps, tool-calling agents, and long-context analysis | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1m | 1.05m |
| Cheapest output | $5/1M tokens | $15/1M tokens |
| Provider routes | 2 tracked | 4 tracked |
| Shared benchmarks | MMLU PRO leader | 7 shared |
Decision tradeoffs
- Gemini 3 Pro holds a shared-benchmark lead on MMLU PRO, ahead by 4.3 points.
- Gemini 3 Pro has the lower cheapest tracked output price at $5/1M tokens.
- Local decision data tags Gemini 3 Pro for Coding, RAG, and Agents.
- GPT-5.4 holds a shared-benchmark lead on SWE-bench Pro, ahead by 15.2 points.
- GPT-5.4 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- GPT-5.4 has broader tracked provider coverage for fallback and route flexibility.
- GPT-5.4 uniquely exposes Reasoning and Structured outputs in local model data.
- Local decision data tags GPT-5.4 for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Gemini 3 Pro
$2,250
Cheapest tracked route/tier: GCP Vertex AI
GPT-5.4
$5,750
Cheapest tracked route/tier: OpenAI API
Estimated monthly gap: $3,500. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for Gemini 3 Pro and GPT-5.4; plan for SDK, billing, or endpoint changes.
- GPT-5.4 is $10/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- GPT-5.4 adds Reasoning and Structured outputs in local capability data.
- No overlapping tracked provider route is sourced for GPT-5.4 and Gemini 3 Pro; plan for SDK, billing, or endpoint changes.
- Gemini 3 Pro is $10/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Reasoning and Structured outputs before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-12-11 | 2026-03-05 |
| Context window | 1m | 1.05m |
| Parameters | — | — |
| Architecture | Decoder Only | Decoder Only |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | 2025-01 | 2025-08 |
Pricing and availability
| Pricing attribute | Gemini 3 Pro | GPT-5.4 |
|---|---|---|
| Input price | $1.25/1M tokens |
|
| Output price | $5/1M tokens |
|
| Providers |
Capabilities
| Capability | Gemini 3 Pro | GPT-5.4 |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | No | Yes |
| JSON / Tool use | Yes | Yes |
| Structured outputs | No | Yes |
| Code execution | Yes | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Gemini 3 Pro | GPT-5.4 |
|---|---|---|
| MMLU PRO | 91.8 | 87.5 |
| SWE-bench Verified | 76.2 | 71.7 |
| SWE-bench Pro | 42.5 | 57.7 |
| Google-Proof Q&A | 91.9 | 92.0 |
| Massive Multi-discipline Multimodal Understanding | 81.0 | 82.1 |
| Chatbot Arena | 1486.0 | 1479.0 |
| MMMU Pro | 81.0 | 81.2 |
Continue comparing
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.