Model comparison
GPT-5.6 Terra vs o3-pro
Head-to-head evidence from 2 shared benchmark results across 1 category. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5.6 Terra #11 (Estimated); o3-pro #127 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.6 Terra and o3-pro share 2 comparable benchmark results. 0 of 8 categories are comparable. 41 results are unique to GPT-5.6 Terra; 0 to o3-pro.
Updated July 18, 2026- Shared results
- 2
- GPT-5.6 Terra only
- 41
- o3-pro only
- 0
- Comparable categories
- 0 / 8
Benchmark data for GPT-5.6 Terra and o3-pro is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 2 shared benchmark results across 1 evidence category; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM has partial data for these models, but not enough overlapping benchmark coverage to produce a fair score-level comparison yet.
o3-pro is priced at $20.00 input / $80.00 output per 1M tokens, versus $2.50 input / $15.00 output per 1M tokens for GPT-5.6 Terra. GPT-5.6 Terra has the larger context window at 1M, compared with 200K for o3-pro.
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 | o3-pro |
|---|---|---|---|
| Agentic | GPT-5.6 Terra87.4 | MarginNo overlap | o3-proNot measured |
| Coding | GPT-5.6 Terra63.4 | MarginNo overlap | o3-proNot measured |
| Knowledge | GPT-5.6 Terra92.9 | MarginNo overlap | o3-proNot measured |
| Math | GPT-5.6 Terra80.8 | MarginNo overlap | o3-proNot measured |
| Multimodal | GPT-5.6 Terra80.7 | MarginNo overlap | o3-proNot measured |
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.6 Terra | o3-pro | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.6 Terra$2.5 input / $15 output | o3-pro$20 input / $80 output | GPT-5.6 Terra has the lower combined listed price. |
| Generation speedtokens per second | GPT-5.6 TerraNot available | o3-pro27 tok/s | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-5.6 TerraNot available | o3-pro84.93 s | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-5.6 Terra1M | o3-pro200K | GPT-5.6 Terra lists the larger context window. |
Benchmark Deep Dive
Agentic16 benchmarks
| Benchmark | GPT-5.6 Terra | o3-pro | Result |
|---|---|---|---|
| Terminal-Bench 2.0Source | 87.4% | — | Not comparable |
| 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% | — | Not comparable |
| τ²-bench resultsSource | 86.3% | — | Not comparable |
| GDPval-AASource | 54.6% | — | Not comparable |
| GDPval-AASource | 1593 | — | Not comparable |
| 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 |
Coding7 benchmarks
| Benchmark | GPT-5.6 Terra | o3-pro | Result |
|---|---|---|---|
| SWE-bench ProSource | 63.4% | — | Not comparable |
| Terminal-Bench 2.0Source | 87.4% | — | Not comparable |
| deepSweSource | 69.6% | — | Not comparable |
| FrontierCode 1.1 ExtendedSource | 55.8% | — | Not comparable |
| cursorBench32Source | 64.9% | — | Not comparable |
| AA Coding IndexSource | 76.7% | — | Not comparable |
| AA-SciCodeSource | 53.9% | — | Not comparable |
Reasoning3 benchmarks
Knowledge10 benchmarks
| Benchmark | GPT-5.6 Terra | o3-pro | Result |
|---|---|---|---|
| GPQASource | 92.9% | — | Not comparable |
| GPQA-DSource | 92.9% | — | Not comparable |
| HealthBench ProfessionalSource | 57.7% | — | Not comparable |
| HealthBench HardSource | 32.7% | — | Not comparable |
| Artificial Analysis Intelligence IndexSource | 55.0% | 32.5% | GPT-5.6 Terra leads |
| AA-GPQA DiamondSource | 92.5% | 84.5% | GPT-5.6 Terra leads |
| AA-HLESource | 41.8% | — | Not comparable |
| AA-Omniscience IndexSource | -0.2% | — | Not comparable |
| AA-Omniscience AccuracySource | 45.9% | — | Not comparable |
| AA-Omniscience Hallucination RateSource | 85.2% | — | Not comparable |
Math3 benchmarks
Multimodal3 benchmarks
Inst. Following1 benchmarks
| Benchmark | GPT-5.6 Terra | o3-pro | Result |
|---|---|---|---|
| AA-IFBenchSource | 71.2% | — | Not comparable |
Frequently Asked Questions (3)
Can I compare GPT-5.6 Terra and o3-pro on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for GPT-5.6 Terra and o3-pro today?
GPT-5.6 Terra: $2.50 input / $15.00 output per 1M tokens o3-pro: $20.00 input / $80.00 output per 1M tokens Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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