Gemini 2.5 Pro vs GPT-5 Codex (Comparative Analysis)
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Comparative Analysis: Gemini 2.5 Pro vs. GPT-5 Codex
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Overview
Gemini 2.5 Pro was released 3 months before GPT-5 Codex.
 Gemini 2.5 Pro |  GPT-5 Codex | |
|---|---|---|
Model Provider The organization behind this AI's development | Google | OpenAI |
Input Context Window Maximum input tokens this model can process at once | 1M tokens | 400K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 65.5K tokens | 128K tokens |
Release Date When this model first became publicly available | June 17, 2025 1 year ago June 17th, 2025 | September 23, 2025 9 months ago September 23rd, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | January 31, 2025 | September 30, 2024 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
Gemini 2.5 Pro | GPT-5 Codex | |
|---|---|---|
Input Types Supported input formats | 📝Text🖼️Image📁File🎵Audio🎬Video | 📝Text🖼️Image |
Reasoning Controls Defaults and configurable reasoning effort | Always enabled | Always enabled |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Gemini | GPT |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation |
Pricing
Gemini 2.5 Pro is roughly 1.0x less expensive compared to GPT-5 Codex for input tokens and roughly 1.0x less expensive for output tokens.
| Gemini 2.5 Pro | GPT-5 Codex | |
|---|---|---|
Short Context Pricing Base rates before a long-context threshold applies | ||
Input Token Cost Cost per million input tokens | $1.25 per million tokens | $1.25 per million tokens |
Output Token Cost Cost per million output tokens | $10.00 per million tokens | $10.00 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.014 per search | $0.01 per search |
Cache Read Cost Cost to reuse cached input tokens | $0.13 per million tokens | $0.13 per million tokens |
Cache Write Cost Cost to write input tokens to the cache | $0.38 per million tokens | Not specified |
Reasoning Token Cost Cost for internal reasoning tokens | $10.00 per million tokens | Not specified |
Image Input Cost Additional cost for each image input | $0.00000125 per image | Not specified |
Audio Input Cost Additional cost for audio input | $0.00000125 per unit | Not specified |
Audio Cache Cost Cost to reuse cached audio input tokens | $0.13 per million tokens | Not specified |
Long Context Pricing Rates for prompts with 200,000 or more tokens | ||
Input Token Cost Long-context input cost per million tokens | $2.50 per million tokens | Not specified |
Output Token Cost Long-context output cost per million tokens | $15.00 per million tokens | Not specified |
Cache Read Cost Long-context cache read cost per million tokens | $0.25 per million tokens | Not specified |
Benchmarks
Compare relevant benchmarks between Gemini 2.5 Pro and GPT-5 Codex.
| Gemini 2.5 Pro | GPT-5 Codex | |
|---|---|---|
Intelligence Index Overall model quality across independent evaluations | 25.8 (Artificial Analysis index; higher is better) | Benchmark not available. |
Coding Index Programming performance across independent evaluations | 33.3 (Artificial Analysis index; higher is better) | Benchmark not available. |
Agentic Index Ability to complete multi-step agentic tasks | 7.1 (Artificial Analysis index; higher is better) | Benchmark not available. |
Best Design Arena Score Highest human-preference Elo score across design arenas | 1,285 Elo (#13 in Data Viz (71.8% win rate)) | 1,138 Elo (#23 in Webapps (52.4% win rate)) |
At a Glance
Quick overview of what makes Gemini 2.5 Pro and GPT-5 Codex unique.
Gemini 2.5 Pro by Google understands both text and images, handles audio, analyzes video, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 1M token context window. Reasonably priced at $1.25/M input and $10.00/M output tokens. Released June 17th, 2025.GPT-5 Codex by OpenAI understands both text and images, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 400K token context window. Reasonably priced at $1.25/M input and $10.00/M output tokens. Includes built-in content moderation for safer outputs. Released September 23rd, 2025.Explore More Comparisons
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Compare GPT-5 Codex with:
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Technical analysis and explanations
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