Foundation Model Landscape

Alibaba’s Qwen3 family spanning Qwen3.8-Max (2.4T MoE / 95B active; live cloud alias qwen3.8-max routes to the 0902 snapshot as of 2026-09-05), open Qwen3.8-27B (dense VLM, Apache-2.0), Qwen3.8-Flash-Next (125B / 6B active multimodal MoE + 51B n-gram embeddings)—a Qwen4 architecture preview—and Qwen3.8-Omni-Flash (hosted 2026-09-17: text/image/audio/video in, text out, 1M context; API id qwen3.8-omni-flash). Production Qwen3.8-Flash on QwenCloud adds 1M-default context and built-in tools atop the Flash-Next design.

Anthropic’s Claude Opus 5.5 (API id claude-opus-5-5, released 2026-09-22) for complex agentic coding, enterprise work, long-context analysis, and careful instruction following. Anthropic says it matches Fable 5.1 on most work at a lower price. Fable 5.1 remains a separate higher list-price SKU. Sonnet 5.5 (claude-sonnet-5-5, 2026-09-28) is the current Sonnet at the same $2/$10 list price as Sonnet 5. Haiku 5.5 (claude-haiku-5-5, 2026-10-07) is the current Haiku.

Anthropic’s Claude Sonnet 5.5 (API id claude-sonnet-5-5, released 2026-09-28) for well-scoped everyday coding, agents, and documents. List price matches Sonnet 5 at $2/$10 per 1M tokens. Opus 5.5 remains the high-stakes tier; Haiku 5.5 (2026-10-07) is the low-cost subagent and high-volume tier.

Anthropic’s Claude Fable 5.1 — the most capable widely released Claude for long-horizon agents, deep reasoning, and demanding coding workflows. Mythos 5.1 is the same underlying model with relaxed cyber/life-sciences safeguards for trusted-access programs.

Anthropic’s fast, cost-efficient Claude tier for high-volume chat, classification, extraction, and sub-agent steps where latency and price matter more than peak reasoning. Claude Haiku 5.5 (API id claude-haiku-5-5, released 2026-10-07) is the current Haiku: Anthropic’s fastest model at standard speed, the first Haiku with an adjustable effort setting, and around 75% cheaper to run than Haiku 4.5 on average. Sonnet 5.5 and Opus 5.5 remain better for complex agentic coding.

DeepSeek’s reasoning-focused model trained with reinforcement learning for multi-step math, science, and coding problem solving.

DeepSeek’s V4 generation — live Flash is V4.1-Flash-1017 (API id deepseek-flash, upgraded 2026-10-17): Causal Encoder–Decoder MoE, 552B backbone (8B active prefill / 16B decode), native image+text, and 1M context. API id and prices are unchanged from the 2026-09-10 Flash list. MIT weights on Hugging Face. Legacy deepseek-v4-flash and deepseek-v4-flash-vision-exp aliases temporarily route here. deepseek-v4-pro still serves V4-Pro-0813 after 2026-09-14 at unchanged Pro rates (DeepSeek withdrew the planned Flash reroute).

Google’s Pro-class Gemini for hard reasoning and native multimodal work. Prefer API id gemini-3.1-pro-preview; Gemini 3.5 Pro remains partner-testing. This slug is not Gemini 4 Argon (gemini-4-argon, public 2026-10-13). On the Gemini API, gemini-2.5-pro has no announced shutdown date and is not deprecated; access is limited to projects that have already used it.

Stable Gemini API id gemini-4-argon, released 13 October 2026. Google’s model page describes it as the flagship for complex software engineering, deep mathematical and scientific problems, autonomous multi-step agents, and long decode. Thinking can be set to low, medium, or high. The long-decode guide names medium as the default for most coding and agentic work. It documents function calling, structured outputs, code execution, search grounding, URL context, and file search. Computer use is in preview. The model page does not document native MCP support. Image generation, audio generation, and the Live API are not supported.

Meta’s Llama 4 family — open-weight multimodal models designed for research and commercial use under Meta’s community license.

Meta Superintelligence Labs’ Muse Wonder (API id muse-wonder-1.0, 2026-10-12) — closed model for longer agentic coding and professional tasks on the Meta Model API and in Muse Code. It sits above Muse Spark 1.3, which remains the lower-priced API. Muse Wonder Full is a Muse Code subscriber variant; the public pricing page lists only muse-wonder-1.0. Preview. Closed weights.

Meta Superintelligence Labs’ Muse Spark 1.3 — closed multimodal model for agentic tasks, long-horizon coding, computer use, and 1M-context workflows via Muse Code and the Meta Model API. As of 2026-10-12 it is the lower-priced API under Muse Wonder (muse-wonder-1.0), not Meta’s peak. Succeeds Spark 1.2; max reasoning is still withheld for safety testing. Muse Spark Open (2026-10-15) is a separate weight release, not this API id.

Meta Superintelligence Labs’ Muse Glimmer — Apache-2.0 ~30B dense multimodal agent model for on-device and single-GPU local agents. Sibling to closed Muse Spark and Muse Wonder; distinct from Llama 4.

Moonshot’s Kimi K3 family — 2.8T MoE (104B active), 1M context, native vision. Hugging Face weights under the Kimi K3 License (moonshotai/Kimi-K3) remain the downloadable checkpoint, including in GitHub Copilot. Kimi K3.1 Pro (2026-10-23) is a post-trained K3 and the current API flagship: kimi-k3.1-pro, plus kimi-k3.1-pro-highspeed, which Moonshot says is 2–3× faster. Both are on Kimi.ai, Kimi Work, Kimi Code, and the Kimi API. Moonshot says full K3.1 Pro weights will be released by 2026-11-04. Kimi Enterprise access to K3.1 Pro is off by default. The launch post does not publish token prices.

OpenAI’s GPT-5.6 family (Sol flagship, Terra balanced, Luna cost-efficient) for complex reasoning, coding, multimodal understanding, and agentic tool use. The gpt-5.6 API alias routes to Sol. GPT-6.1 Sol (gpt-6.1-sol, 2026-09-29) is the current lower-cost Sol; GPT-6 Sol and Luna (2026-09-22) are earlier cost tiers. This entry remains GPT-5.6, which is still available.

Meta’s Llama 4 family — open-weight multimodal models designed for research and commercial use under Meta’s community license.

DeepSeek’s reasoning-focused model trained with reinforcement learning for multi-step math, science, and coding problem solving.

DeepSeek’s V4 generation — live Flash is V4.1-Flash-1017 (API id deepseek-flash, upgraded 2026-10-17): Causal Encoder–Decoder MoE, 552B backbone (8B active prefill / 16B decode), native image+text, and 1M context. API id and prices are unchanged from the 2026-09-10 Flash list. MIT weights on Hugging Face. Legacy deepseek-v4-flash and deepseek-v4-flash-vision-exp aliases temporarily route here. deepseek-v4-pro still serves V4-Pro-0813 after 2026-09-14 at unchanged Pro rates (DeepSeek withdrew the planned Flash reroute).

Moonshot’s Kimi K3 family — 2.8T MoE (104B active), 1M context, native vision. Hugging Face weights under the Kimi K3 License (moonshotai/Kimi-K3) remain the downloadable checkpoint, including in GitHub Copilot. Kimi K3.1 Pro (2026-10-23) is a post-trained K3 and the current API flagship: kimi-k3.1-pro, plus kimi-k3.1-pro-highspeed, which Moonshot says is 2–3× faster. Both are on Kimi.ai, Kimi Work, Kimi Code, and the Kimi API. Moonshot says full K3.1 Pro weights will be released by 2026-11-04. Kimi Enterprise access to K3.1 Pro is off by default. The launch post does not publish token prices.

Meta Superintelligence Labs’ Muse Glimmer — Apache-2.0 ~30B dense multimodal agent model for on-device and single-GPU local agents. Sibling to closed Muse Spark and Muse Wonder; distinct from Llama 4.

Alibaba’s Qwen3 family spanning Qwen3.8-Max (2.4T MoE / 95B active; live cloud alias qwen3.8-max routes to the 0902 snapshot as of 2026-09-05), open Qwen3.8-27B (dense VLM, Apache-2.0), Qwen3.8-Flash-Next (125B / 6B active multimodal MoE + 51B n-gram embeddings)—a Qwen4 architecture preview—and Qwen3.8-Omni-Flash (hosted 2026-09-17: text/image/audio/video in, text out, 1M context; API id qwen3.8-omni-flash). Production Qwen3.8-Flash on QwenCloud adds 1M-default context and built-in tools atop the Flash-Next design.

OpenAI’s GPT-5.6 family (Sol flagship, Terra balanced, Luna cost-efficient) for complex reasoning, coding, multimodal understanding, and agentic tool use. The gpt-5.6 API alias routes to Sol. GPT-6.1 Sol (gpt-6.1-sol, 2026-09-29) is the current lower-cost Sol; GPT-6 Sol and Luna (2026-09-22) are earlier cost tiers. This entry remains GPT-5.6, which is still available.

Anthropic’s Claude Opus 5.5 (API id claude-opus-5-5, released 2026-09-22) for complex agentic coding, enterprise work, long-context analysis, and careful instruction following. Anthropic says it matches Fable 5.1 on most work at a lower price. Fable 5.1 remains a separate higher list-price SKU. Sonnet 5.5 (claude-sonnet-5-5, 2026-09-28) is the current Sonnet at the same $2/$10 list price as Sonnet 5. Haiku 5.5 (claude-haiku-5-5, 2026-10-07) is the current Haiku.

Anthropic’s Claude Sonnet 5.5 (API id claude-sonnet-5-5, released 2026-09-28) for well-scoped everyday coding, agents, and documents. List price matches Sonnet 5 at $2/$10 per 1M tokens. Opus 5.5 remains the high-stakes tier; Haiku 5.5 (2026-10-07) is the low-cost subagent and high-volume tier.

Anthropic’s Claude Fable 5.1 — the most capable widely released Claude for long-horizon agents, deep reasoning, and demanding coding workflows. Mythos 5.1 is the same underlying model with relaxed cyber/life-sciences safeguards for trusted-access programs.

Anthropic’s fast, cost-efficient Claude tier for high-volume chat, classification, extraction, and sub-agent steps where latency and price matter more than peak reasoning. Claude Haiku 5.5 (API id claude-haiku-5-5, released 2026-10-07) is the current Haiku: Anthropic’s fastest model at standard speed, the first Haiku with an adjustable effort setting, and around 75% cheaper to run than Haiku 4.5 on average. Sonnet 5.5 and Opus 5.5 remain better for complex agentic coding.

Google’s Pro-class Gemini for hard reasoning and native multimodal work. Prefer API id gemini-3.1-pro-preview; Gemini 3.5 Pro remains partner-testing. This slug is not Gemini 4 Argon (gemini-4-argon, public 2026-10-13). On the Gemini API, gemini-2.5-pro has no announced shutdown date and is not deprecated; access is limited to projects that have already used it.

Stable Gemini API id gemini-4-argon, released 13 October 2026. Google’s model page describes it as the flagship for complex software engineering, deep mathematical and scientific problems, autonomous multi-step agents, and long decode. Thinking can be set to low, medium, or high. The long-decode guide names medium as the default for most coding and agentic work. It documents function calling, structured outputs, code execution, search grounding, URL context, and file search. Computer use is in preview. The model page does not document native MCP support. Image generation, audio generation, and the Live API are not supported.

Meta Superintelligence Labs’ Muse Wonder (API id muse-wonder-1.0, 2026-10-12) — closed model for longer agentic coding and professional tasks on the Meta Model API and in Muse Code. It sits above Muse Spark 1.3, which remains the lower-priced API. Muse Wonder Full is a Muse Code subscriber variant; the public pricing page lists only muse-wonder-1.0. Preview. Closed weights.

Meta Superintelligence Labs’ Muse Spark 1.3 — closed multimodal model for agentic tasks, long-horizon coding, computer use, and 1M-context workflows via Muse Code and the Meta Model API. As of 2026-10-12 it is the lower-priced API under Muse Wonder (muse-wonder-1.0), not Meta’s peak. Succeeds Spark 1.2; max reasoning is still withheld for safety testing. Muse Spark Open (2026-10-15) is a separate weight release, not this API id.