Gpt-5.5

GPT-5.5 Batch API and Flex mode both offer 50% off standard pricing — $2.50 per 1M input tokens and $15 per 1M output tokens versus the standard $5/$30 — giving high-volume AI coding teams a direct path to halving their monthly API spend without changing models or degrading output quality. What Is GPT-5.5 Batch API and Flex Mode? GPT-5.5 Batch API and Flex mode are two distinct pricing and execution tiers from OpenAI that both deliver 50% cost savings compared to standard API rates, but differ significantly in how and when results are returned. The Batch API is a fire-and-forget system: you submit up to 50,000 requests in a single JSONL file (up to 200MB), and OpenAI guarantees results within 24 hours. Flex mode, currently in beta as of April 2026, is interactive — requests are processed in real time but with variable latency ranging from a few seconds to several minutes, depending on platform load. GPT-5.5 launched on April 23, 2026, at standard pricing of $5 per 1M input tokens and $30 per 1M output tokens. Both Batch and Flex bring that cost down to $2.50/$15 — the same price as GPT-5.4 standard, but with GPT-5.5’s higher capability, including an 82.7% score on Terminal-Bench 2.0 and 58.6% on SWE-Bench Pro. For engineering teams running nightly code reviews, eval pipelines, or test generation jobs, the practical implication is straightforward: you get a better model at the same cost you were already paying. ...

GPT-5.5’s hosted shell and apply_patch tools let you run autonomous coding agents that explore filesystems, execute commands, and apply precise code edits — all inside an OpenAI-managed Debian 12 sandbox with no infrastructure to maintain. What Are OpenAI’s Compute Tools? Hosted Shell and Apply Patch Explained OpenAI’s compute tools are two purpose-built capabilities in the Responses API that give models direct access to code execution environments and structured file-editing primitives. The hosted shell tool provisions an ephemeral Debian 12 container where GPT-5.5 can run arbitrary shell commands — installing packages, running test suites, inspecting file trees, and producing downloadable artifacts via /mnt/data. The apply_patch tool gives the model a structured way to propose file modifications using the V4A diff format, which supports create_file, update_file, and delete_file operations with surgical precision. Together, these two tools form a closed loop: the model explores a codebase with shell commands, identifies what needs to change, and applies those changes via structured patches — without the host application needing to interpret or re-execute diffs. As of April 2026, these tools are only available through the Responses API (not the Chat Completions API) and require GPT-5.5 or compatible models. The combination represents OpenAI’s most direct answer to Claude Code, GitHub Copilot Agent, and similar agentic coding platforms. ...