Model Comparison
Gemini 2.5 Pro Preview 06-05 vs GPT-5.3 CodexWhich is better in 2026?
Comparing Gemini 2.5 Pro Preview 06-05 and GPT-5.3 Codex across benchmarks, pricing, and capabilities.
Verdict: Gemini 2.5 Pro Preview 06-05 vs GPT-5.3 Codex — which is better?
Gemini 2.5 Pro Preview 06-05 (by Google) and GPT-5.3 Codex (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.
On price, Gemini 2.5 Pro Preview 06-05 is roughly 1.4x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Gemini 2.5 Pro Preview 06-05 also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.
Choose Gemini 2.5 Pro Preview 06-05 if…
- cost matters — it's about 1.4x cheaper per token
- you process long inputs — it offers a 1,048,576 token context window
Choose GPT-5.3 Codex if…
- you want the most recent training data — it shipped Feb 2026
Performance Benchmarks
Comparative analysis across standard metrics
Gemini 2.5 Pro Preview 06-05 and GPT-5.3 Codex don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, Gemini 2.5 Pro Preview 06-05 ($1.25/1M tokens) is 1.4x cheaper than GPT-5.3 Codex ($1.75/1M tokens).
For output processing, Gemini 2.5 Pro Preview 06-05 ($10.00/1M tokens) is 1.4x cheaper than GPT-5.3 Codex ($14.00/1M tokens).
In conclusion, GPT-5.3 Codex is more expensive than Gemini 2.5 Pro Preview 06-05.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Gemini 2.5 Pro Preview 06-05 accepts 1,048,576 input tokens compared to GPT-5.3 Codex's 400,000 tokens. GPT-5.3 Codex can generate longer responses up to 128,000 tokens, while Gemini 2.5 Pro Preview 06-05 is limited to 65,535 tokens.
Input Capabilities
Supported data types and modalities
Both Gemini 2.5 Pro Preview 06-05 and GPT-5.3 Codex support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
Gemini 2.5 Pro Preview 06-05
GPT-5.3 Codex
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Gemini 2.5 Pro Preview 06-05 was released on 2025-06-05, while GPT-5.3 Codex was released on 2026-02-05.
GPT-5.3 Codex is 8 months newer than Gemini 2.5 Pro Preview 06-05.
Jun 5, 2025
1.0 years ago
Feb 5, 2026
4 months ago
8mo newerKnowledge Cutoff
When training data ends
Gemini 2.5 Pro Preview 06-05 has a documented knowledge cutoff of 2025-01-31, while GPT-5.3 Codex's cutoff date is not specified.
We can confirm Gemini 2.5 Pro Preview 06-05's training data extends to 2025-01-31, but cannot make a direct comparison without GPT-5.3 Codex's cutoff date.
Jan 2025
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Provider Availability
Gemini 2.5 Pro Preview 06-05 is available from Google. GPT-5.3 Codex is available from OpenAI.
Gemini 2.5 Pro Preview 06-05
GPT-5.3 Codex
Outputs Comparison
Key Takeaways
No standout differentiators in the data we have for this pair.
Detailed Comparison
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FAQ
Common questions about Gemini 2.5 Pro Preview 06-05 vs GPT-5.3 Codex.