GPT-5.6 Terra vs GPT-6 Astra: Specs & Benchmark Comparison
| Characteristic | GPT-5.6 Terra | GPT-6 Astra |
|---|---|---|
| Company | OpenAI | OpenAI |
| Release Date | July 9, 2026 | September 3, 2026 |
| Parameters | — | — |
| Multimodal | Yes | Yes |
| Context (input) | 1.1M | 1.1M |
| Context (output) | 128K | 128K |
| Input Price / 1M | $2.00 | $10.00 |
| Output Price / 1M | $12.00 | $50.00 |
| Average Score | 0.6 | 0.7 |
| Benchmarks | ||
| ARC-AGI-3 | 0.0 | 1.0 |
| ExploitBench | 0.5 | 1.0 |
| FrontierMath Tier 4 (v2) | 0.7 | 1.0 |
| SEC-bench Pro | 0.6 | 0.9 |
| AutomationBench | 0.2 | 0.4 |
| OSWorld 2.0 | 0.5 | 0.7 |
| ExploitGym | 0.2 | 0.4 |
| BenchCAD (with Python tool) | 0.8 | 1.0 |
| GeneBench-Pro | 0.2 | 0.4 |
| FrontierCode 1.1 | 0.4 | 0.5 |
| Agents' Last Exam | 0.5 | 0.6 |
| HealthBench Professional | 0.6 | 0.6 |
| LifeSciBench | 0.6 | 0.6 |
| DeepSWE 1.1 | 0.7 | 0.7 |
| BrowseComp | 0.9 | 0.9 |
| GPQA | 0.9 | 1.0 |
Visual Benchmark Comparison
GPT-5.6 Terra
GPT-6 Astra
ARC-AGI-30.0 vs 1.0
1.0
ExploitBench0.5 vs 1.0
0.5
1.0
FrontierMath Tier 4 (v2)0.7 vs 1.0
0.7
1.0
SEC-bench Pro0.6 vs 0.9
0.6
0.9
AutomationBench0.2 vs 0.4
0.2
0.4
OSWorld 2.00.5 vs 0.7
0.5
0.7
ExploitGym0.2 vs 0.4
0.2
0.4
BenchCAD (with Python tool)0.8 vs 1.0
0.8
1.0
GeneBench-Pro0.2 vs 0.4
0.2
0.4
FrontierCode 1.10.4 vs 0.5
0.4
0.5
Agents' Last Exam0.5 vs 0.6
0.5
0.6
HealthBench Professional0.6 vs 0.6
0.6
0.6
LifeSciBench0.6 vs 0.6
0.6
0.6
DeepSWE 1.10.7 vs 0.7
0.7
0.7
BrowseComp0.9 vs 0.9
0.9
0.9
Verdict
Both models show equal results — the choice depends on your specific use case.
Overall Performance
Both models show comparable average scores: GPT-5.6 Terra — 0.6, GPT-6 Astra — 0.7.
API Cost
GPT-5.6 Terra is 4.3x cheaper: input $2.00/1M vs $10.00/1M tokens.
Context Window
Same context size: 1M tokens.
Recency
GPT-6 Astra is newer: released 9/3/2026 vs 7/9/2026.
More About These Models
Related Comparisons
Frequently Asked Questions
Which is better for coding — GPT-5.6 Terra or GPT-6 Astra?
Direct comparison on the SWE-Bench benchmark is not available. We recommend reviewing other metrics on the comparison page.
Which model is cheaper — GPT-5.6 Terra or GPT-6 Astra?
GPT-5.6 Terra is cheaper for input: $2.00 per 1M tokens vs $10.00.
Which has a larger context window — GPT-5.6 Terra or GPT-6 Astra?
GPT-5.6 Terra supports a larger context: 1,050,000 tokens vs 1,050,000.
The GPT-5.6 Terra and GPT-6 Astra comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the GPT-5.6 Terra or GPT-6 Astra page. See also the complete list of AI model comparisons.