Chat model · Meta ·
Muse Spark 1.3 is a chat model by Meta. In Endless it costs 101.3 credits per 1M input tokens and 344.3 per 1M output tokens, on every plan.
Muse Spark 1.3 is Meta's model for long coding and agent work, finishing multi-step tasks in one thread with fewer tool calls and tokens than 1.2.
101.3 / 344.3 credits per 1M tokens
Muse Spark 1.3 is Meta's update to Muse Spark 1.2, released in September 2026. It keeps the same 1M-token context window and the same price, and focuses on getting long work done with less waste: in Meta's internal comparisons it uses about 20% fewer tool calls and 25% fewer tokens than 1.2 for the same tasks.
It is built for work that runs for a long time in a single thread. Given an open-ended goal, it gathers its own context with tools, notices gaps in its plan and corrects them. It asks a clarifying question when a brief is ambiguous, says when it is stuck, and checks with you before a consequential step.
In Endless chat you can give it a long brief, pasted code or screenshots, then switch to another model in the same workspace to review what it produced. Usage draws on the credits your workspace shares.
Start a chat in your workspace and choose Muse Spark 1.3 in the model picker.
Attach files, mention a project with @, or ask it to search the web and social media.
Generate images and video, write documents and save what matters to a project.
by Meta
Long agent tasks that plan, delegate and keep going until they're done
324 / 1620 credits per 1M tokens
by Meta
Long coding sessions and agent runs that span whole repositories
101.3 / 344.3 credits per 1M tokens
by OpenAI
Fast visual reasoning, computer use and natural writing at low cost
81 / 405 credits per 1M tokens
Muse Spark 1.3 is on every plan, including Free. Create a workspace and get 100 credits to start, plus 50 credits every week.