Tasks and inputs
GPT-6 Astra (Fast) is listed for Image-text-to-text, Text generation. It accepts text, image, pdf and produces text. Use the publisher’s input format and preprocessing for your chosen deployment.
SyncDev model directory · Profile updated Oct 13, 2026
Fast service tier for GPT-6 Astra. Use the GPT-6 Astra API model ID with the Fast request setting; this is a processing mode, not a separate model family.
Pricing conditions: Fast mode is a service tier. Rates depend on service tier and prompt length; use the first-party pricing table for the complete request.
Recorded modality support shows what this model can accept and produce. An undocumented modality is shown as unknown rather than assumed to be unsupported.
Accepts
Produces
GPT-6 Astra Fast refers to faster processing of GPT-6 Astra requests. The first-party model ID remains gpt-6-astra. The registry’s fast suffix is useful for distinguishing a hosting route, but should not be copied into an OpenAI API call as a separate model ID.
OpenAI documents Fast mode through the request’s service tier. Its model page prices Fast at twice the applicable rates, while long prompts have their own multipliers. Budget using the returned service tier and usage, rather than applying a single starting token price to every request.
The model accepts text and images and returns text. Its documented context window is 1,050,000 tokens with 128,000 maximum output tokens. Selecting a faster tier changes processing conditions; it does not establish a new context allowance or a different set of learned capabilities.
For a tool-using workflow, measure the whole run, including connection setup, tool execution and retries. A faster model response may have little effect when most of the time is spent in a slow external tool. Use identical prompts, reasoning settings and task acceptance rules when comparing service tiers.
OpenAI also documents an Ultrafast tier. Fast and Ultrafast are distinct settings with different access, rate-limit and pricing conditions. Select the one your integration intends to use and verify what the response reports. The source links below distinguish the model, processing tier and request configuration.
Compare the model on the work you need to complete.
GPT-6 Astra (Fast) is listed for Image-text-to-text, Text generation. It accepts text, image, pdf and produces text. Use the publisher’s input format and preprocessing for your chosen deployment.
Documented limits: 1.05M context and 128K maximum output. Measure a completed task using the prompts, documents and tools your application will use. Include reasoning and retries in the result.
Use the model identifier and account requirements for the selected API route. Confirm its request limits and output format with one complete task before connecting a larger workflow.
These records share a directory category. Check the source card, output type and deployment requirements before treating a model as a replacement.
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