GPT-6 Astra vs IBM Granite 4.2 30B: Specs & Benchmark Comparison
GPT-6 Astra is developed by OpenAI, while IBM Granite 4.2 30B comes from IBM. IBM Granite 4.2 30B was released in August 2026, and GPT-6 Astra followed a month later in September 2026. IBM Granite 4.2 30B has a published size of about 30 billion parameters; OpenAI has not disclosed the parameter count of GPT-6 Astra.
We have 22 benchmark results for GPT-6 Astra and 18 benchmark results for IBM Granite 4.2 30B, but they overlap on a single test: GPQA Diamond, where GPT-6 Astra scores 96.0% against 66.4%.
GPT-6 Astra is available through an API at $10 per million input tokens with a 1M-token context window. We do not track a hosted API for IBM Granite 4.2 30B, so pricing and context cannot be compared directly.
| Characteristic | GPT-6 Astra | IBM Granite 4.2 30B |
|---|---|---|
| Company | OpenAI | IBM |
| Release Date | September 4, 2026 | August 25, 2026 |
| Parameters | — | 30B |
| Multimodal | Yes | No |
| Context (input) | 1.1M | — |
| Context (output) | 128K | — |
| Input Price / 1M | $10.00 | — |
| Output Price / 1M | $50.00 | — |
| Average Score | 74.4% | 62.4% |
| Benchmarks | ||
| GPQA Diamond | 96.0% | 66.4% |
Visual Benchmark Comparison
Verdict
Both models show equal results — the choice depends on your specific use case.
Both models show comparable average scores: GPT-6 Astra — 0.7, IBM Granite 4.2 30B — 0.6.
Both models were released around the same time: 9/4/2026 and 8/25/2026.
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Frequently Asked Questions
Which is better for coding — GPT-6 Astra or IBM Granite 4.2 30B?
Which model is cheaper — GPT-6 Astra or IBM Granite 4.2 30B?
Which has a larger context window — GPT-6 Astra or IBM Granite 4.2 30B?
The GPT-6 Astra and IBM Granite 4.2 30B 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 IBM Granite 4.2 30B page. See also the complete list of AI model comparisons.