GPT-5.6
OpenAI's flagship GPT model released April 23, 2026. The standard tier for GPT-5.6 family. $2.50/$15 per 1M input/output tokens. Strongest in complex multi-step reasoning, agentic workflows, and hard mathematics.
Best For
Strengths
- Best-in-class agent mode (multi-step task execution)
- Strongest math and science reasoning
- 1M token context window
- Native multimodal: text + image + audio + video understanding
- Function calling and tool use accuracy at 95%+
Weaknesses
- Most expensive among top-tier models
- Slower than Flash variants
- Sometimes verbose; verbose tuning needed
- Strict refusal behavior on borderline prompts
Related Alternatives
Claude Opus 4.8
Better for code and long-doc analysis
Gemini 3.5 Pro
Better Google Workspace integration
Kimi K3
Better for Chinese tasks, 5x cheaper
Frequently Asked Questions
How much does GPT-5.6 cost?
GPT-5.6 standard API costs $2.50 per 1M input tokens and $15 per 1M output tokens. The cheaper GPT-5.6 Luna variant costs $0.20/$1.20 per 1M (about 12x cheaper). ChatGPT Plus subscription at $20/month gives web access.
Is GPT-5.6 better than Claude Opus 4.8?
It depends on the task. GPT-5.6 wins for math, science, and multi-step agent workflows. Claude Opus 4.8 wins for code reasoning, long-form analysis, and nuanced writing. Most developers use both via API based on task type.
What is GPT-5.6's context window?
GPT-5.6 supports 1 million tokens of context, equivalent to ~750,000 words or 5-7 novels. It can process entire codebases or long documents without chunking.
See GPT-5.6's full record in our database
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