# GPT-5.6 Sol, Terra and Luna, Muse Spark 1.1, Tencent Hy3

> OpenAI ships a three-model GPT-5.6 family, Meta upgrades Muse Spark, and Tencent opens a 295B Apache 2.0 model.

Published 13 Oct 2026. Coverage: 6 Jul 2026 to 12 Jul 2026. By Ali Asif.

## Items

1. **GPT-5.6 family: Sol, Terra and Luna** (OpenAI, Frontier): Released July 9 as a flagship (Sol), a balanced model (Terra) and a high-volume model (Luna), with programmatic tool calling and a multi-agent beta. [Primary source](https://developers.openai.com/api/docs/guides/latest-model?model=gpt-5.6)
2. **Muse Spark 1.1** (Meta Superintelligence Labs, Frontier): A July 9 upgrade focused on tool and computer use, coding and multimodal understanding, with a 1M-token context and a public preview of the Meta Model API. [Primary source](https://ai.meta.com/blog/introducing-muse-spark-meta-model-api/)
3. **Hy3** (Tencent, Open weights): A 295B mixture-of-experts open model under Apache 2.0 with about 21B active parameters, reported at July 6. [Primary source](https://huggingface.co/tencent/Hy3)
4. **GPT-Realtime-2.1** (OpenAI, Frontier): A July 6 update to the realtime voice model, with a lower-cost mini version. [Primary source](https://developers.openai.com/api/docs/models/gpt-realtime-2.1)
5. **Codex joins the ChatGPT desktop app** (OpenAI, Agents and coding): July 9 brought Codex into the ChatGPT desktop app on macOS and Windows, with PR Chat and in-app editing. [Primary source](https://learn.chatgpt.com/docs/changelog)
6. **Dreams for Managed Agents supports Fable 5 and Sonnet 5** (Anthropic, Agents and coding): The July 10 notes add both new models to Dreams, a research-preview feature for Managed Agents. [Primary source](https://platform.claude.com/docs/en/release-notes/overview)
7. **Gemma 4 Technical Report** (arXiv, Open weights): The write-up behind Google's Gemma 4 family, on Hugging Face's weekly list. [Primary source](https://arxiv.org/abs/2607.02770)
8. **AlayaWorld: Long-Horizon and Playable Video World Generation** (arXiv, Image, video, world): A video world model aimed at long, playable generations, second on the weekly list. [Primary source](https://arxiv.org/abs/2607.06291)
9. **Vidu S1: A Real-Time Interactive Video Generation Model** (arXiv, Image, video, world): A video model built for interactive, real-time generation, first on the weekly papers list. [Primary source](https://arxiv.org/abs/2607.03118)

OpenAI ended a long quiet stretch at the top of its range, and the week's other big launch came from Meta.

## GPT-5.6

On July 9 OpenAI released the GPT-5.6 family in three variants. Sol is the flagship, and the plain gpt-5.6 alias routes to it. Terra balances capability and cost. Luna is for high-volume work where efficiency matters most. The guide lists programmatic tool calling, where the model writes JavaScript to call tools and process results in a hosted runtime, a multi-agent beta in the Responses API that coordinates parallel subagents, explicit prompt caching, persisted reasoning across turns, a max reasoning level above xhigh, and a pro mode that spends more effort to return one answer.

The page does not list context sizes or per-variant prices, so I will hold off on cost comparisons. Cache writes cost 1.25 times the uncached input rate. OpenAI also released GPT-Realtime-2.1 and a cheaper mini on July 6.

## Muse Spark 1.1

Meta Superintelligence Labs shipped Muse Spark 1.1 on July 9. It is described as a multimodal reasoning model for agentic work, with gains in tool and computer use, coding and multimodal understanding, and a one-million-token context. It can act as a main agent that plans and delegates to parallel subagents, or as a subagent that escalates when needed. A public preview of the Meta Model API opens access, and Thinking mode is live in the Meta AI app. No pricing is published yet.

## Open weights

Tencent's Hy3 landed July 6 as a 295B mixture-of-experts model with about 21B active parameters under Apache 2.0, with BF16 and FP8 variants and a 256K context according to coverage. The Gemma 4 technical report also surfaced on Hugging Face's weekly list.

## Tools and papers

Codex joined the ChatGPT desktop app on July 9, with PR Chat and in-app editing. On July 10 Anthropic added Fable 5 and Sonnet 5 support to Dreams, its research-preview feature for agents. On the papers list, Vidu S1 aims at real-time interactive video and AlayaWorld at long, playable world generation.

What I'd watch next: GPT-5.6 context sizes and per-variant prices once they are published, since the routing math depends on them.

## My take

Three GPT-5.6 sizes with a stated job for each is the right way to sell models to people like me. I would use the cheap tier for bulk extraction from supplier PDFs and keep the flagship for the call that signs off a quote. The multi-agent beta in the Responses API is the line I will read twice, because that is how I already run my own agents.

## Sources

- https://developers.openai.com/api/docs/guides/latest-model?model=gpt-5.6
- https://ai.meta.com/blog/introducing-muse-spark-meta-model-api/
- https://huggingface.co/tencent/Hy3
- https://developers.openai.com/api/docs/models/gpt-realtime-2.1
- https://learn.chatgpt.com/docs/changelog
- https://platform.claude.com/docs/en/release-notes/overview
- https://arxiv.org/abs/2607.02770
- https://arxiv.org/abs/2607.06291
- https://arxiv.org/abs/2607.03118

Canonical: https://heyaliasif.com/ai/2026-07-06-week-in-ai