Gemma 4 31B vs GPT-5 Codex (Comparative Analysis)
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Comparative Analysis: Gemma 4 31B vs. GPT-5 Codex
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Overview
GPT-5 Codex was released 6 months before Gemma 4 31B.
 Gemma 4 31B |  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 | 262.1K tokens | 400K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 262.1K tokens | 128K tokens |
Release Date When this model first became publicly available | April 2, 2026 3 months ago April 2nd, 2026 | September 23, 2025 10 months ago September 23rd, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | Not reported | September 30, 2024 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
Gemma 4 31B | GPT-5 Codex | |
|---|---|---|
Input Types Supported input formats | 🖼️Image📝Text🎬Video | 📝Text🖼️Image |
Reasoning Controls Defaults and configurable reasoning effort | Optional | Always enabled |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | Gemma | GPT |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation | ✓Function Calling✓Structured Output✓Reasoning Mode✓Content Moderation |
Open Source Model availability | Available on HuggingFace → | Proprietary |
Pricing
Gemma 4 31B is roughly 0.1x less expensive compared to GPT-5 Codex for input tokens and roughly 0.04x less expensive for output tokens.
| Gemma 4 31B | GPT-5 Codex | |
|---|---|---|
Input Token Cost Cost per million input tokens | $0.14 per million tokens | $1.25 per million tokens |
Output Token Cost Cost per million output tokens | $0.40 per million tokens | $10.00 per million tokens |
Web Search Cost Additional cost for each web search operation | Not specified | $0.01 per search |
Cache Read Cost Cost to reuse cached input tokens | Not specified | $0.13 per million tokens |
Benchmarks
Compare relevant benchmarks between Gemma 4 31B and GPT-5 Codex.
| Gemma 4 31B | GPT-5 Codex | |
|---|---|---|
Intelligence Index Overall model quality across independent evaluations | 29.4 (Artificial Analysis index; higher is better) | Benchmark not available. |
Coding Index Programming performance across independent evaluations | 43.4 (Artificial Analysis index; higher is better) | Benchmark not available. |
Agentic Index Ability to complete multi-step agentic tasks | 14.4 (Artificial Analysis index; higher is better) | Benchmark not available. |
Best Design Arena Score Highest human-preference Elo score across design arenas | Benchmark not available. | 1,138 Elo (#26 in Webapps (52.4% win rate)) |
At a Glance
Quick overview of what makes Gemma 4 31B and GPT-5 Codex unique.
Gemma 4 31B by Google understands both text and images, analyzes video, can use external tools and APIs, offers advanced reasoning, generates structured data. It can handle standard conversations with its 262.1K token context window. Very affordable at $0.14/M input and $0.40/M output tokens. Released April 2nd, 2026.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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🔬Science
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