OpenAI API release notes, H1 2026: GPT-5.4, GPT-5.5; Sora 1080p output priced at $0.74 per second.
A dense first half of 2026 on the OpenAI API: GPT-5.4 and GPT-5.5 with 1M-token context, a full gpt-realtime-2 audio suite, an expanded Sora API at $0.74/second for 1080p, plus spend limits, moderation scores, and Secure MCP Tunnel.
OpenAI
OpenAI ships GPT-5.6 as a three-tier family: Sol, Terra, and Luna
GPT-5.6 lands July 7, 2026 as three tiers — Sol, Terra, and Luna — with a 1,113,000-token context window, programmatic tool calling, and explicit prompt caching across /v1/responses, /v1/chat/completions, and /v1/batch.
From prompts to products: one year of the Responses API
One year after launch, OpenAI's Responses API has become the default agent-native surface — stateful conversations, background jobs, and built-in tools — with thousands of developers shipping across support, legal, life sciences, and travel.
OpenAI for Developers in 2025: the year AI got easier to run in production
OpenAI's year-end developer roundup traces 2025's shift to agent-native APIs, the convergence of o1/o3/o4-mini reasoning into the GPT-5.x line, GPT-5.2-Codex, and full multimodal support across text, image, audio, and video.
OpenAI GPT-5: One Model for Everything
OpenAI released GPT-5 as its first unified flagship that combines the intelligence of the o-series reasoning models with the versatility of GPT-4o, posting 95%+ on GPQA Diamond and leading SWE-bench Verified while running in a single model API endpoint.
OpenAI Releases o3 and o3-mini to All API Tiers
OpenAI made o3 and o3-mini generally available across all API usage tiers, ending the limited research preview period and exposing adjustable reasoning effort levels, native tool use, and vision support to the full developer population.