Claude Opus 5.5, GPT-6.1 Terra, Gemini 4 Argon and DeepSeek V4.1 Flash are among the available models; Google has set a December migration date for Gemini 2.5 API users.

Current baseline as of November 4, 2026:

• Anthropic: Claude Opus 5.5 is available via Claude Platform (claude-opus-5-5) and major cloud platforms. Standard API pricing is $4 per million input tokens and $20 per million output tokens; cached reads cost $0.20 per million.
• OpenAI: GPT-6.1 Terra is rolling out in Work, Codex and the API as gpt-6.1-terra, at $1 input, $0.05 cached input and $5 output per million tokens. GPT-6 Rosalind Research is rolling out to approved life-sciences researchers in Work, Codex and the API as gpt-6-rosalind.
• Google: Gemini 4 Argon is generally available in the API as gemini-4-argon, with a 1,048,576-token unified context, and is rolling out in the Gemini app for AI Pro and Ultra subscribers. On December 1, API requests to gemini-2.5-pro and gemini-2.5-flash will route to newer models at their rates; Google advises migration because of breaking API changes.
• DeepSeek: V4.1 Flash 1017 is available in the app, web and API as deepseek-flash. Its downloadable weights carry an MIT license. The API offers 1M context and charges $0.15–$0.30 input and $0.60–$1.20 output per million tokens, depending on time of use.
• xAI: Grok 4.7 is available as grok-4.7, with 500k context and tiered API pricing; Grok Voice 3.0 is available, while Voice 2.0 is deprecated.