Model comparison
GPT-5.6 Terra vs Hy3 Preview
Head-to-head evidence from 17 shared benchmark results across 4 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5.6 Terra #11 (Estimated); Hy3 Preview unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.6 Terra and Hy3 Preview share 17 comparable benchmark results. 3 of 8 categories are comparable. 26 results are unique to GPT-5.6 Terra; 5 to Hy3 Preview.
Updated July 18, 2026- Shared results
- 17
- GPT-5.6 Terra only
- 26
- Hy3 Preview only
- 5
- Comparable categories
- 3 / 8
Treat this as a split decision. GPT-5.6 Terra makes more sense if knowledge is the priority or you need the larger 1M context window; Hy3 Preview is the better fit if you want the cheaper token bill.
Confidence note. This is a partial-evidence comparison with 17 shared benchmark results across 4 evidence categories; 3 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
GPT-5.6 Terra and Hy3 Preview finish on the same BenchAlign overall score, so this is less about a single winner and more about where the edge shows up. The BenchAlign headline says tie; the benchmark table is where the real choice happens.
GPT-5.6 Terra is also the more expensive model on tokens at $2.50 input / $15.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Hy3 Preview. That is roughly Infinityx on output cost alone. GPT-5.6 Terra gives you the larger context window at 1M, compared with 256K for Hy3 Preview.
Category breakdown
Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.
| Category | GPT-5.6 Terra | Δ | Hy3 Preview |
|---|---|---|---|
| Knowledge | GPT-5.6 Terra92.9 | Margin← 59.1 | Hy3 Preview33.8 |
| Agentic | GPT-5.6 Terra87.4 | Margin← 33.0 | Hy3 Preview54.4 |
| Coding | GPT-5.6 Terra63.4 | Margin← 5.6 | Hy3 Preview57.8 |
| Math | GPT-5.6 Terra80.8 | MarginNo overlap | Hy3 PreviewNot measured |
| Multimodal | GPT-5.6 Terra80.7 | MarginNo overlap | Hy3 PreviewNot measured |
| Inst. Following | GPT-5.6 TerraNot measured | MarginNo overlap | Hy3 Preview63.1 |
Decisive benchmark drivers
The largest measured benchmark gaps in this matchup, with exact reported values.
More
- Source ↗
Terminal-Bench 2.0
AgenticA 87.4%B 54.4%Winner: GPT-5.6 TerraΔ 33Terminal-Bench 2.0: GPT-5.6 Terra scored 87.4%; Hy3 Preview scored 54.4%. GPT-5.6 Terra wins this benchmark. - Source ↗
GPQA
KnowledgeA 92.9%B 87.2%Winner: GPT-5.6 TerraΔ 5.7GPQA: GPT-5.6 Terra scored 92.9%; Hy3 Preview scored 87.2%. GPT-5.6 Terra wins this benchmark.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.6 Terra | Hy3 Preview | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.6 Terra$2.5 input / $15 output | Hy3 Preview$0 input / $0 output | Hy3 Preview has the lower combined listed price. |
| Generation speedtokens per second | GPT-5.6 TerraNot available | Hy3 PreviewNot available | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-5.6 TerraNot available | Hy3 PreviewNot available | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-5.6 Terra1M | Hy3 Preview256K | GPT-5.6 Terra lists the larger context window. |
Benchmark Deep Dive
AgenticGPT-5.6 Terra wins17 benchmarks
| Benchmark | GPT-5.6 Terra | Hy3 Preview | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 87.4% | 54.4% | GPT-5.6 Terra leads |
| BrowseCompSource | 87.5% | — | Not comparable |
| OSWorld 2.0Source | 50.2% | — | Not comparable |
| CyberGymSource | 81.8% | — | Not comparable |
| ExploitGymSource | 23.2% | — | Not comparable |
| ToolathlonSource | 53.1% | — | Not comparable |
| AA Agentic IndexSource | 47.4% | 30.7% | GPT-5.6 Terra leads |
| τ²-bench resultsSource | 86.3% | — | Not comparable |
| GDPval-AASource | 54.6% | 35.7% | GPT-5.6 Terra leads |
| GDPval-AASource | 1593 | 1214 | GPT-5.6 Terra leads |
| AA Harvey LABSource | 2.5% | — | Not comparable |
| AA ITBenchSource | 51.0% | — | Not comparable |
| AA Tau3 BankingSource | 31.8% | — | Not comparable |
| AA AutomationBenchSource | 45.6% | — | Not comparable |
| terminalBenchHardSource | 57.6% | — | Not comparable |
| aaTerminalBench21Source | 88% | — | Not comparable |
| Gert LabsSource | — | 36.91% | Not comparable |
CodingGPT-5.6 Terra wins9 benchmarks
| Benchmark | GPT-5.6 Terra | Hy3 Preview | Result |
|---|---|---|---|
| SWE-bench ProSource | 63.4% | — | Not comparable |
| Terminal-Bench 2.0Source | 87.4% | 54.4% | GPT-5.6 Terra leads |
| deepSweSource | 69.6% | — | Not comparable |
| FrontierCode 1.1 ExtendedSource | 55.8% | — | Not comparable |
| cursorBench32Source | 64.9% | — | Not comparable |
| AA Coding IndexSource | 76.7% | 58.8% | GPT-5.6 Terra leads |
| AA-SciCodeSource | 53.9% | 47.6% | GPT-5.6 Terra leads |
| SWE-bench VerifiedSource | — | 74.4% | Not comparable |
| SciCodeSource | — | 41.2% | Not comparable |
Reasoning3 benchmarks
KnowledgeGPT-5.6 Terra wins11 benchmarks
| Benchmark | GPT-5.6 Terra | Hy3 Preview | Result |
|---|---|---|---|
| GPQASource | 92.9% | 87.2% | GPT-5.6 Terra leads |
| GPQA-DSource | 92.9% | 87.2% | GPT-5.6 Terra leads |
| HealthBench ProfessionalSource | 57.7% | — | Not comparable |
| HealthBench HardSource | 32.7% | — | Not comparable |
| Artificial Analysis Intelligence IndexSource | 55.0% | 41.2% | GPT-5.6 Terra leads |
| AA-GPQA DiamondSource | 92.5% | 89.7% | GPT-5.6 Terra leads |
| AA-HLESource | 41.8% | 31.6% | GPT-5.6 Terra leads |
| AA-Omniscience IndexSource | -0.2% | -18.5% | GPT-5.6 Terra leads |
| AA-Omniscience AccuracySource | 45.9% | 31.5% | GPT-5.6 Terra leads |
| AA-Omniscience Hallucination RateSource | 85.2% | 73.0% | Hy3 Preview leads |
| HLESource | — | 25.5% | Not comparable |
Math3 benchmarks
Multimodal3 benchmarks
Frequently Asked Questions (4)
Which is better, GPT-5.6 Terra or Hy3 Preview?
GPT-5.6 Terra and Hy3 Preview are tied on the BenchAlign overall score, so the right pick depends on which category matters most for your use case.
Which is better for knowledge tasks, GPT-5.6 Terra or Hy3 Preview?
GPT-5.6 Terra has the edge for knowledge tasks in this comparison, averaging 92.9 versus 33.8. Inside this category, AA-Omniscience Index is the benchmark that creates the most daylight between them.
Which is better for coding, GPT-5.6 Terra or Hy3 Preview?
GPT-5.6 Terra has the edge for coding in this comparison, averaging 63.4 versus 57.8. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, GPT-5.6 Terra or Hy3 Preview?
GPT-5.6 Terra has the edge for agentic tasks in this comparison, averaging 87.4 versus 54.4. Inside this category, GDPval-AA is the benchmark that creates the most daylight between them.
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