GPT-5.1-Codex-Max vs Sonar Pro (Comparative Analysis)
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Comparative Analysis: GPT-5.1-Codex-Max vs. Sonar Pro
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Overview
Sonar Pro was released 9 months before GPT-5.1-Codex-Max.
 GPT-5.1-Codex-Max |  Sonar Pro | |
|---|---|---|
Model Provider The organization behind this AI's development | OpenAI | Perplexity |
Input Context Window Maximum input tokens this model can process at once | 400K tokens | 200K tokens |
Output Token Limit Maximum output tokens this model can generate at once | 128K tokens | 8K tokens |
Release Date When this model first became publicly available | December 4, 2025 7 months ago December 4th, 2025 | March 7, 2025 1 year ago March 7th, 2025 |
Capabilities & Features
Compare supported features, modalities, and advanced capabilities
GPT-5.1-Codex-Max | Sonar Pro | |
|---|---|---|
Input Types Supported input formats | 📝Text🖼️Image | 📝Text🖼️Image |
Reasoning Controls Defaults and configurable reasoning effort | Always enabledEffort: Extra High, High, Medium, LowDefault: Medium | Not reported |
Output Types Supported output formats | 📝Text | 📝Text |
Tokenizer Text encoding system | GPT | Other |
Key Features Advanced capabilities | ✓Function Calling✓Structured Output✓Reasoning ModeContent Moderation | Function CallingStructured OutputReasoning ModeContent Moderation |
Pricing
GPT-5.1-Codex-Max is roughly 0.4x less expensive compared to Sonar Pro for input tokens and roughly 0.7x less expensive for output tokens.
| GPT-5.1-Codex-Max | Sonar Pro | |
|---|---|---|
Input Token Cost Cost per million input tokens | $1.25 per million tokens | $3.00 per million tokens |
Output Token Cost Cost per million output tokens | $10.00 per million tokens | $15.00 per million tokens |
Web Search Cost Additional cost for each web search operation | $0.01 per search | $0.005 per search |
Cache Read Cost Cost to reuse cached input tokens | $0.13 per million tokens | Not specified |
At a Glance
Quick overview of what makes GPT-5.1-Codex-Max and Sonar Pro unique.
GPT-5.1-Codex-Max 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. Released December 4th, 2025.Sonar Pro by Perplexity understands both text and images. It can handle standard conversations with its 200K token context window. Premium pricing at $3.00/M input and $15.00/M output tokens. Released March 7th, 2025.Explore More Comparisons
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