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Muse has released Ember, described as its smallest and most efficient model, built for tool calls, coding subtasks, routing, extraction and long document parsing. According to benchmarking data cited by the company, Ember matches Claude Haiku 5.5's top score at roughly a third of the cost and outperforms GPT-6 Luna at every reasoning setting tested.
Village's LLM Atlas, which tracks the strongest AI model at every price point, now shows open-weight models winning only 3% of budget tiers, down from 41% in June. Most of that decline followed OpenAI's GPT-6 Luna and GPT-6.1 Terra releases along with Anthropic's Claude Haiku 5.5, which reclaimed budgets previously held by DeepSeek V4 Flash and Zhipu's GLM-5.2.
OpenAI has launched GPT-6.1 Terra, the latest addition to its model lineup following GPT-5.6 Terra and GPT-6.1 Sol. The company says Terra delivers output quality close to GPT-6.1 Sol and sometimes near flagship GPT-6 Astra, while running at roughly half the API cost of its predecessor.
Inception Labs released Mercury 3, a text-diffusion large language model it says outperforms GPT-6 Luna and Claude Haiku 5.5 on various benchmarks while generating over 1,000 tokens per second. The model supports a 1-million-token context window, up from 260K in Mercury 2.5, and is priced at $0.20 per million input tokens and $0.70 per million output tokens, discounted 50% at launch. Early-access partners are reportedly using it for chat support, tutoring, data engineering, and web-browsing agents.
OpenAI has released a public beta of a new Decisions API that evaluates text and images and returns typed answers—probabilities, choices, or scores—about 10x faster than its Responses API. The endpoint, POST /v1/decisions, currently supports only the gpt-6-luna model, and requests combine a model, shared input evidence, and a set of named questions. OpenAI says general availability is expected in the coming weeks.
OpenAI announced it will reopen its $200 Pro subscription to new subscribers, alongside a change to how usage is calculated that effectively halves the equivalent API spend compared to the previous version of the plan. The company says it will not reintroduce a prior 5-hour usage limit, and plans to add new subscription features, not yet detailed, that won't count against usage limits. OpenAI also noted it recently cut prices on its GPT-6 Sol and GPT-6 Luna models by 50%.
OpenAI launched GPT-6 Sol and GPT-6 Luna, positioned as cheaper, more accurate successors to GPT-5.6 Sol and Luna, with API costs cut by 50%. OpenAI says GPT-6 Sol outperforms Claude Opus 5 at roughly 9% of its cost and matches Claude Fable 5.1 on coding tasks at lower cost, while making about half as many errors as its predecessor. Both models are rolling out today in ChatGPT Work and Codex for Pro, Plus, Business, Enterprise, and Edu users, with Luna also available to Free and Go plan users in the desktop app.
Anthropic released Opus 5.5, an update to its flagship coding and knowledge-work model, while OpenAI released GPT-6 Sol and Luna, updates to its mid-tier and smaller efficiency-focused models. Anthropic says Opus 5.5 cuts token pricing by 20%, cuts cache-read costs by 60%, and runs over 30% faster than its predecessor, while benchmarks from Anthropic show it modestly outperforming OpenAI's recently released GPT-6 Astra on coding tasks.
Anthropic released Opus 5.5, an update to Claude aimed at enterprise tasks like coding, financial analysis and business work, claiming better agentic coding benchmarks than GPT-6 Astra and reduced token pricing compared to Opus 5. OpenAI simultaneously released GPT-6 Sol and GPT-6 Luna, cheaper successors to GPT-5.6 that the company says cut factual errors roughly in half and match rival Fable 5.1's coding performance at lower cost.
OpenAI launched GPT-6 Sol and GPT-6 Luna, follow-ups to its 5.6 models and companions to the recently released GPT-6 Astra, aimed at giving businesses and developers Astra-level capability at lower cost with higher usage limits. Anthropic simultaneously released Claude Opus 5.5, which it says matches Fable 5.1's performance while cutting costs nearly 40% compared to Opus 5, and calls its most aligned model yet.
OpenAI has updated its smaller GPT-6 models, Sol and Luna, following this month's launch of the flagship GPT-6 Astra. The company says API access to the new Sol and Luna models costs half as much as the previous 5.6 series, citing gains in caching and inference, and claims GPT-6 Sol makes roughly half as many factual mistakes as its predecessor while also reducing coding errors.