GPT-3.5 Turbo Instruct vs GPT-5.1-Codex-Mini (Comparative Analysis)
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Comparative Analysis: GPT-3.5 Turbo Instruct vs. GPT-5.1-Codex-Mini
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Overview
GPT-3.5 Turbo Instruct was released 2 years before GPT-5.1-Codex-Mini.
 GPT-3.5 Turbo Instruct | GPT-5.1-Codex-Mini | |
|---|---|---|
Model Provider The organization behind this AI's development | OpenAI | OpenAI |
Input Context Window Maximum input tokens this model can process at once | 4.1K tokens | 400K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 4.1K tokens | 128K tokens |
Release Date When this model first became publicly available | September 28, 2023 2 years ago September 28th, 2023 | November 13, 2025 9 months ago November 13th, 2025 |
Knowledge Cutoff Latest training-data date reported by the provider | September 30, 2021 | Not reported |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
GPT-3.5 Turbo Instruct | GPT-5.1-Codex-Mini | |
|---|---|---|
Input Types Supported input formats | 📝Text | 🖼️Image📝Text |
Reasoning Controls Defaults and configurable reasoning effort | Not reported | OptionalEffort: High, Medium, LowDefault: Medium |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | GPT | GPT |
Key Features Advanced capabilities | Function Calling✓Structured OutputReasoning Mode✓Content Moderation | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation |
Pricing
GPT-3.5 Turbo Instruct is roughly 6.0x more expensive compared to GPT-5.1-Codex-Mini for input tokens and roughly 1.0x less expensive for output tokens.
| GPT-3.5 Turbo Instruct | GPT-5.1-Codex-Mini | |
|---|---|---|
Input Token Cost Cost per million input tokens | $1.50 per million tokens | $0.25 per million tokens |
Output Token Cost Cost per million output tokens | $2.00 per million tokens | $2.00 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 | $0.03 per million tokens |
Benchmarks
Compare relevant benchmarks between GPT-3.5 Turbo Instruct and GPT-5.1-Codex-Mini.
| GPT-3.5 Turbo Instruct | GPT-5.1-Codex-Mini | |
|---|---|---|
Best Design Arena Score Highest human-preference Elo score across design arenas | Benchmark not available. | 1,143 Elo (#46 in Asciiart (43.0% win rate)) |
At a Glance
Quick overview of what makes GPT-3.5 Turbo Instruct and GPT-5.1-Codex-Mini unique.
GPT-3.5 Turbo Instruct by OpenAI generates structured data. It can handle standard conversations with its 4.1K token context window. Reasonably priced at $1.50/M input and $2.00/M output tokens. Includes built-in content moderation for safer outputs. Released September 28th, 2023.GPT-5.1-Codex-Mini 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 $0.25/M input and $2.00/M output tokens. Released November 13th, 2025.Explore More Comparisons
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