Gemini 2.5 Pro Preview 05-06 vs GPT-5 Codex
A side-by-side comparison of two multimodal models — real specs, pricing, strengths and weaknesses, and a clear verdict on which to choose. Kept current by our agents.
Quick verdict: which should you choose?
Choose Gemini 2.5 Pro Preview 05-06 if you need
- ✓Strong coding specialization with unified text and image reasoning
- ✓Documented intelligence index of 44.6 and output speed of 149.9 t/s
- ✓Reliable performance on extremely large inputs up to 400k context
- ✓Avoid preview-stage variability
Choose GPT-5 Codex if you need
- ✓Context window exceeding 1M tokens with flexible file handling
- ✓Native support for text, images, audio, video and files
- ✓Strong cross-modal reasoning across multiple modalities
- ✓Maximum scale for mixed-media or very long inputs
Verdict
Gemini 2.5 Pro Preview 05-06 leads in raw context scale and native multi-modal breadth while GPT-5 Codex leads in documented coding specialization and measurable intelligence/speed. Both share identical $10/1M pricing and proprietary status, but GPT-5 Codex is restricted to text plus static images whereas Gemini supports audio, video and files. The preview status of Gemini introduces potential variability not noted for GPT-5 Codex.
Gemini 2.5 Pro Preview 05-06 vs GPT-5 Codex: side by side
| Spec | Gemini 2.5 Pro Preview 05-06 | GPT-5 Codex | Winner |
|---|---|---|---|
| Intelligence | — | 44.6 | Tie |
| Output speed | — | 150 t/s | Tie |
| Output price | $10.00/1M | $10.00/1M | Tie |
| Context | 1049K | 400K | Gemini 2.5 Pro Preview 05-06 |
| Params | — | — | Tie |
| Type | Proprietary | Proprietary | Tie |
| Provider | OpenAI | Tie |
Detailed analysis
Context Window
Winner: Gemini 2.5 Pro Preview 05-06Gemini 2.5 Pro Preview 05-06 provides 1,048,576 tokens versus GPT-5 Codex's 400,000. Both models note high resource demands at maximum context. The larger window directly supports Gemini's listed strength in very large inputs.
Modalities Supported
Winner: Gemini 2.5 Pro Preview 05-06Gemini 2.5 Pro Preview 05-06 natively handles text, images, audio, video and files with strong cross-modal reasoning. GPT-5 Codex is limited to text and static images with unified text-image reasoning. This gives Gemini broader multimodal coverage per the provided strengths.
Coding & Intelligence
Winner: GPT-5 CodexGPT-5 Codex lists strong coding specialization and a concrete intelligence_index of 44.6. Gemini 2.5 Pro Preview 05-06 provides no intelligence or speed metrics. The documented coding focus favors GPT-5 Codex on this dimension.
Pricing
Winner: TieBoth models are priced at $10 per 1M tokens. No other cost differences are stated in the facts. Pricing is therefore identical.
Gemini 2.5 Pro Preview 05-06
Pros
- +Very large context window
- +Native support for multiple modalities
- +Strong cross-modal reasoning
- +Flexible file handling
Cons
- –Preview version may show variability
- –High resource use with maximum context
- –Occasional modality-specific inconsistencies
GPT-5 Codex
Pros
- +Handles extremely large inputs effectively
- +Strong coding specialization
- +Unified text and image reasoning
Cons
- –High resource demands with maximum context
- –Limited to text and static images
- –Potential coherence loss in very long outputs
Summary: Gemini 2.5 Pro Preview 05-06 vs GPT-5 Codex
Select GPT-5 Codex when coding specialization and known performance metrics matter most. Choose Gemini 2.5 Pro Preview 05-06 when maximum context and native multi-modal file support are required. Both remain proprietary with equal pricing.
Frequently asked questions
Gemini 2.5 Pro Preview 05-06 leads on context size and modality breadth; GPT-5 Codex leads on documented coding strength and measurable intelligence/speed.