Gemini 2.5 Pro vs GPT-5.4
Gemini 2.5 Pro (2025) and GPT-5.4 (2026) are frontier-tier reasoning models from Google DeepMind and OpenAI. Gemini 2.5 Pro ships a 1m-token context window, while GPT-5.4 ships a 1.05m-token context window. On MMLU PRO, GPT-5.4 leads by 1.3 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 2.5 Pro when coding workflow support matters.
Decision scorecard
Local evidence first| Signal | Gemini 2.5 Pro | GPT-5.4 |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | 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 | $10/1M tokens | $15/1M tokens |
| Provider routes | 4 tracked | 4 tracked |
| Shared benchmarks | 7 shared | MMLU PRO leader |
Decision tradeoffs
- Gemini 2.5 Pro has the lower cheapest tracked output price at $10/1M tokens.
- Local decision data tags Gemini 2.5 Pro for Coding, RAG, and Agents.
- GPT-5.4 holds a shared-benchmark lead on MMLU PRO, ahead by 1.3 points.
- GPT-5.4 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- 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 2.5 Pro
$3,500
Cheapest tracked route/tier: Google AI Studio <=200K tokens
GPT-5.4
$5,750
Cheapest tracked route/tier: OpenAI API
Estimated monthly gap: $2,250. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
- GPT-5.4 is $5/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
- Gemini 2.5 Pro is $5/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-06-17 | 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 2.5 Pro | GPT-5.4 |
|---|---|---|
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| Output price |
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Capabilities
| Capability | Gemini 2.5 Pro | GPT-5.4 |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Gemini 2.5 Pro | GPT-5.4 |
|---|---|---|
| MMLU PRO | 86.2 | 87.5 |
| SWE-bench Verified | 63.8 | 71.7 |
| Google-Proof Q&A | 86.4 | 92.0 |
| Massive Multi-discipline Multimodal Understanding | 81.7 | 82.1 |
| Humanity's Last Exam | 18.8 | 41.6 |
| Chatbot Arena | 1398.0 | 1479.0 |
| Terminal-Bench 2.0 | 32.6 | 75.1 |
Continue comparing
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.