OpenAI: GPT-6 Astra

openai/gpt-6-astra · OpenAINot yet established

Declared family: GPT
Evidence confidence: Unknown
Declared tokenizer tag: GPT
Entered catalogue: 4 September 2026
Last tested: Not yet measured
Measurement: Awaiting measurement

Evidence stack

Signals of different kinds, weighed together

Signal	Result	Reference
Tokenizer signature	Not measured	–
API surface	Identical contract to 2 other entries	api_77e6e9c6
Context and output	1,050,000 context · 128,000 max output	declared
Reasoning contract	Mandatory · efforts max, xhigh, high, medium, low · default medium	declared
Serving providers observed	None recorded yet	–

Declared record

What the catalogue claims about this model

GPT-6 Astra is OpenAI's flagship model for demanding end-to-end work. It is suited for advanced analysis, software engineering, deep research, scientific work, and document creation, with particular strengths in long-horizon...

Modalities: text+image+file->text
Declared tokenizer: GPT
Prompt price: $10.0 / M tokens
Completion price: $50.0 / M tokens

Supported parameters

include_reasoningmax_completion_tokensmax_tokensreasoningreasoning_effortresponse_formatseedstructured_outputstool_choicetools

defaults: {}

Catalogue entry

History

Every observation, kept as taken

4 September 2026Enters the OpenRouter catalogue declared as GPT.

Cite this page as the evidence record for OpenAI: GPT-6 Astra: the URL is stable, measurements are dated, and revisions append to the history above. Method: tokenizer fingerprinting, v1, 50 strings.