GPT-6 Astra vs Inkling: Specs & Benchmark Comparison
GPT-6 Astra is developed by OpenAI, while Inkling comes from Thinking Machines Lab. Inkling was released in July 2026, and GPT-6 Astra followed 2 months later in September 2026. Inkling has a published size of about 975 billion parameters; OpenAI has not disclosed the parameter count of GPT-6 Astra.
We have 22 benchmark results for GPT-6 Astra and 16 benchmark results for Inkling, but they overlap on a single test: Humanity's Last Exam (with tools, text-only), where GPT-6 Astra scores 57.2% against 46.0%.
Inkling is the cheaper API at $0.95 per million input tokens and $4.05 per million output tokens, roughly 11 times cheaper than GPT-6 Astra at $10 and $50. GPT-6 Astra takes the larger context window at 1M tokens, compared with 524K for Inkling. GPT-6 Astra accepts text and images as input, while Inkling accepts text, images, and audio. On tooling, only GPT-6 Astra supports function calling and only GPT-6 Astra offers structured output.
| Characteristic | GPT-6 Astra | Inkling |
|---|---|---|
| Company | OpenAI | Thinking Machines Lab |
| Release Date | September 4, 2026 | July 21, 2026 |
| Parameters | — | 975B |
| Multimodal | Yes | Yes |
| Context (input) | 1.1M | 524K |
| Context (output) | 128K | 524K |
| Input Price / 1M | $10.00 | $0.95 |
| Output Price / 1M | $50.00 | $4.05 |
| Average Score | 74.4% | 61.8% |
| Benchmarks | ||
| Humanity's Last Exam (with tools, text-only) | 57.2% | 46.0% |
Visual Benchmark Comparison
Verdict
GPT-6 Astra leads in 2 out of 4 comparison categories.
Both models show comparable average scores: GPT-6 Astra — 0.7, Inkling — 0.6.
Inkling is 12.0x cheaper: input $0.95/1M vs $10.00/1M tokens.
GPT-6 Astra supports a larger context: 1M vs 524K tokens.
GPT-6 Astra is newer: released 9/4/2026 vs 7/21/2026.
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Frequently Asked Questions
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The GPT-6 Astra and Inkling comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-6 Astra or Inkling page. See also the complete list of AI model comparisons.