# GPT-5.6 Terra vs Inkling

> Side-by-side benchmark comparison for GPT-5.6 Terra and Inkling across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-6-terra-vs-inkling
- Last updated: October 14, 2026

- Shared sourced benchmarks: 14
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

Pick GPT-5.6 Terra if you want the stronger benchmark profile. Inkling only makes more sense when its price, context window, or workload-specific category wins matter more than the overall score.

## Summary

- GPT-5.6 Terra leads overall 69.78 to 52.13.
- The clearest category separation is in mathematics, where the averages are 90.1 for GPT-5.6 Terra and 58.3 for Inkling.
- The biggest single benchmark swing is FrontierMath v2 (Tier 4) in Mathematics, with scores of 68.300% and 4.878%.
- Inkling is the cheaper option on output tokens, which matters if you expect large responses or heavy interactive use.
- GPT-5.6 Terra also has the larger context window at 1.05M.

## Model Snapshot

| Property | GPT-5.6 Terra | Inkling |
|----------|----------|----------|
| Creator | OpenAI | Thinking Machines Lab |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Hybrid |
| Context | 1.05M | 1M |
| Overall Score | 69.78 | 52.13 |
| Benchmarks Covered | 34 | 24 |
| Pricing (input/output) | $2.00 / $12.00 | $1.87 / $4.68 |

## Category Breakdown

### Agentic

- Winner: GPT-5.6 Terra
- GPT-5.6 Terra public-lane score: 58.9 (Supported · #27/124)
- Inkling public-lane score: 36.2 (Supported · #72/124)

| Benchmark | GPT-5.6 Terra | Inkling | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 20.8% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | 87.4% | 63.8% | GPT-5.6 Terra |
| BrowseComp | 87.5% | 77.1% | GPT-5.6 Terra |
| OSWorld 2.0 | 50.2% | Coming soon | Coming soon |
| CyberGym | 81.8% | Coming soon | Coming soon |
| ExploitGym | 23.2% | Coming soon | Coming soon |
| Toolathlon | 53.1% | Coming soon | Coming soon |
| Terminal-Bench 2.1 (Vals) | 77.5% | 47.6% | GPT-5.6 Terra |
| ApprenticeBench | 16% | Coming soon | Coming soon |
| MCP Atlas | Coming soon | 74.1% | Coming soon |
| CWE-bench v1 | Coming soon | 37.0% | Coming soon |

### Coding

- Winner: GPT-5.6 Terra
- GPT-5.6 Terra public-lane score: 62.2 (Supported · #14/149)
- Inkling public-lane score: 34 (Supported · #80/149)

| Benchmark | GPT-5.6 Terra | Inkling | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 63.4% | 54.3% | GPT-5.6 Terra |
| Terminal-Bench 2.1 | 87.4% | 63.8% | GPT-5.6 Terra |
| DeepSWE | 69.6% | Coming soon | Coming soon |
| FrontierCode 1.1 Extended | 55.8% | Coming soon | Coming soon |
| CursorBench 3.2 | 64.9% | Coming soon | Coming soon |
| VulcanBench v3 | 87.0% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 85.9% | 85.5% | GPT-5.6 Terra |
| SWE-bench (Vals) | 95.4% | 77.6% | GPT-5.6 Terra |
| CursorBench 4.0 | 41.3% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 77.6% | Coming soon |
| FrontierSWE v2 | Coming soon | 4.1% | Coming soon |

### Reasoning

- Winner: Directional only
- GPT-5.6 Terra public-lane score: 69.1 (#23/29)
- Inkling public-lane score: 79 (#14/29)

| Benchmark | GPT-5.6 Terra | Inkling | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 83.9% | Coming soon | Coming soon |
| ARC-AGI-3 | 0.8% | Coming soon | Coming soon |
| ARC-AGI-1 | 96.50% | Coming soon | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- GPT-5.6 Terra public-lane score: 84.5 (#11/54)
- Inkling public-lane score: 67.5 (#35/54)

| Benchmark | GPT-5.6 Terra | Inkling | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 80.7% | 73.5% | GPT-5.6 Terra |
| MMMU-Pro w/ Python | 82% | Coming soon | Coming soon |
| CharXiv | Coming soon | 82% | Coming soon |
| CharXiv w/o tools | Coming soon | 78.1% | Coming soon |

### Knowledge

- Winner: GPT-5.6 Terra
- GPT-5.6 Terra public-lane score: 69.9 (Supported · #17/181)
- Inkling public-lane score: 54.5 (Supported · #62/181)

| Benchmark | GPT-5.6 Terra | Inkling | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.9% | 87.9% | GPT-5.6 Terra |
| GPQA-D | 92.9% | 87.9% | GPT-5.6 Terra |
| HLE-Verified | 51.1% | Coming soon | Coming soon |
| LABBench2 | 81.2% | Coming soon | Coming soon |
| HealthBench Professional | 57.7% | Coming soon | Coming soon |
| HealthBench Hard | 32.7% | Coming soon | Coming soon |
| GPQA Diamond (Vals) | 90.9% | 87.1% | GPT-5.6 Terra |
| MMLU-Pro (Vals) | 86.7% | 86.3% | GPT-5.6 Terra |
| HLE | Coming soon | 46% | Coming soon |
| HLE w/o tools | Coming soon | 30% | Coming soon |

### Instruction Following

- Winner: Directional only
- GPT-5.6 Terra public-lane score: 87.1 (#38/128)
- Inkling public-lane score: 87.6 (#35/128)

| Benchmark | GPT-5.6 Terra | Inkling | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 79.8% | Coming soon |

### Mathematics

- Winner: Not comparable
- GPT-5.6 Terra public-lane score: 90.1 (Unranked · 3 rankable rows)
- Inkling public-lane score: 58.3 (#11/12)

| Benchmark | GPT-5.6 Terra | Inkling | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 84.9% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 84.900% | 33.333% | GPT-5.6 Terra |
| FrontierMath v2 (Tier 4) | 68.300% | 4.878% | GPT-5.6 Terra |
| AIME26 | Coming soon | 97.1% | Coming soon |

## FAQ

### Which is better overall, GPT-5.6 Terra or Inkling?

GPT-5.6 Terra is ahead overall on BenchLM right now.

### Where is the biggest gap between GPT-5.6 Terra and Inkling?

The widest category gap is in mathematics, where the averages are 90.1 for GPT-5.6 Terra and 58.3 for Inkling.

### How many benchmarks does GPT-5.6 Terra cover on BenchLM?

GPT-5.6 Terra currently has 34 sourced benchmark scores on BenchLM.

### How many benchmarks does Inkling cover on BenchLM?

Inkling currently has 24 sourced benchmark scores on BenchLM.

## Related Comparisons

- [GPT-5.6 Terra vs GPT-5.6 Sol](/compare/gpt-5-6-sol-vs-gpt-5-6-terra)
- [Inkling vs GPT-5.6 Sol](/compare/gpt-5-6-sol-vs-inkling)
- [GPT-5.6 Terra vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-gpt-5-6-terra)
- [Inkling vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-inkling)

## Explore More

- [GPT-5.6 Terra profile](/models/gpt-5-6-terra)
- [Inkling profile](/models/inkling)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)