The "productivity arsenal" for global developers has once again received an epic enhancement. On February 25, 2026, according to cnBeta, OpenAI's top programming model GPT-5.3-Codex has officially concluded its beta testing and is now fully open for API and third-party platform access for all developers.

This product, hailed as the "strongest AI agent-style programming model," marks a new stage in AI-assisted development, moving from simple code generation to deep understanding of engineering processes.

Core Breakthrough: Not Just "Writing Code," but "Understanding Engineering"

GPT-5.3-Codex has achieved a deep integration of GPT-5.2's general logic with Codex's extreme coding capabilities. Its core advantages include:

Large Context Window: Supports up to 400K Tokens, enabling it to process large codebases at once, completely solving the pain point of cross-file references in complex projects.

Significant Speed Improvement: The overall response speed has increased by 25%, performing particularly well in multi-step agent tasks.

Mid-task Interaction Guidance: It supports developers to intervene during task execution, allowing them to modify directions or add requirements at any time without losing context memory.

Controllable Reasoning Intensity: An additional reasoning_effort parameter (low to xhigh) allows developers to fine-tune the model's thinking depth based on task difficulty.

Proving Its Strength: A Model That Can Self-Improve

Notably, GPT-5.3-Codex demonstrated unprecedented "self-evolution" capabilities during training—this model directly participated in its own debugging, operation, and scheduling deployment process, achieving "self-improvement" in technical paths.

Flexible Access: Multi-platform Coverage and Transparent Pricing

To meet the needs of developers of different scales, OpenAI offers diversified access methods:

Available Across All Channels: In addition to the official API platform, developers can also call it through third-party platforms such as OpenRouter.

Cost-effective Plans: The official Responses API is priced at $1.75 per million input tokens and $14 per million output tokens. By introducing a **cache input** mechanism (at $0.175 per million), the context cost for repeated requests can be significantly reduced.

Industry News Scan

Hardware Cost Pressure: HP recently pointed out that due to memory costs nearly doubling within a quarter, memory now accounts for 35% of the total component cost of PCs, which may lead to price fluctuations in high-performance development machines in the future.

Prediction for Future Work: Professor Zhang Yaqin from Tsinghua University predicts that the number of robots will exceed that of humans in the next 10 years. With AI empowerment, humans may work only two days per week, and their salaries will not decrease but increase instead.

Jack Ma's New Venture: JD.com founder Jack Ma announced his entry into the yacht industry, establishing the brand Sea Expandary, aiming to bring yacht consumption within reach of the working class.