New model releases expand production choices as frontier access stays limited

As of October 21, 2026, major AI providers offer updated models for coding, agents and multimodal workloads, but their newest releases are not always broadly accessible. OpenAI positions GPT-6.1 Sol as its balanced production default, GPT-6 Astra for demanding work and GPT-6 Luna for high-volume tasks. All support a 1.05M-token context window and up to 128K output tokens.

Anthropic’s Claude Sonnet 5.5 targets coding and agents, while Claude Opus 5.5 handles difficult reasoning and Claude Haiku 5.5 serves lower-cost workloads. Claude Fable 5.1 is broadly available for premium tasks, but Mythos 5.1 remains restricted. Google’s generally available Gemini 3.8 Flash supports a 1,048,576-token input context; newer Gemini 4 Argon has phased, trusted access focused on cyber-defense and research.

DeepSeek’s current deepseek-flash endpoint serves DeepSeek-V4.1-Flash-1017, adding vision for lower-cost coding and agent workflows. Grok 4.7 is xAI’s current coding and knowledge model, with claimed capability improvements at its predecessor’s price and speed. Moonshot AI’s Kimi K3 offers published weights, native vision and a 1M-token context, although always-on reasoning can affect cost and latency.

Production selection should account for access restrictions, tool reliability and workload-specific costs rather than release dates alone. Testing 20-50 representative tasks can help compare correctness, latency and total cost. Restricted models such as Gemini 4 Argon and GPT-5.6 Cyber require confirmed access before deployment planning.