# GPT-5.6 Terra vs Inkling-Small

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

- Canonical page: https://benchlm.ai/compare/gpt-5-6-terra-vs-inkling-small
- Last updated: September 10, 2026

- Shared sourced benchmarks: 13
- HTML indexing: indexable
- Ranking lane: BenchAlign v5

## Quick Verdict

Pick GPT-5.6 Terra if you want the stronger benchmark profile. Inkling-Small 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 71.13 to 59.25.
- The clearest category separation is in multimodal & grounded, where the averages are 77.1 for GPT-5.6 Terra and 48.8 for Inkling-Small.
- The biggest single benchmark swing is ARC-AGI-2 in Reasoning, with scores of 83.9% and 40.1%.
- Inkling-Small 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-Small |
|----------|----------|----------|
| Creator | OpenAI | Thinking Machines Lab |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Hybrid |
| Context | 1.05M | 1M |
| Overall Score | 71.13 | 59.25 |
| Benchmarks Covered | 33 | 25 |
| Pricing (input/output) | $2.00 / $12.00 | $0.58 / $1.44 |

## Category Breakdown

### Agentic

- Winner: GPT-5.6 Terra
- GPT-5.6 Terra public-lane score: 60.2 (Supported · #20/152)
- Inkling-Small public-lane score: 36.9 (Supported · #128/152)

| Benchmark | GPT-5.6 Terra | Inkling-Small | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 3.0 | 20.8% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 87.4% | 64.7% | GPT-5.6 Terra |
| BrowseComp | 87.5% | 77.4% | 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% | 55.1% | GPT-5.6 Terra |
| ApprenticeBench | 16% | Coming soon | Coming soon |
| MCP Atlas | Coming soon | 79.6% | Coming soon |
| Toolathlon-Verified | Coming soon | 54.4% | Coming soon |

### Coding

- Winner: GPT-5.6 Terra
- GPT-5.6 Terra public-lane score: 67 (Supported · #8/151)
- Inkling-Small public-lane score: 43.8 (Supported · #97/151)

| Benchmark | GPT-5.6 Terra | Inkling-Small | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Pro | 63.4% | 55.9% | GPT-5.6 Terra |
| Terminal-Bench 2.0 | 87.4% | 64.7% | GPT-5.6 Terra |
| DeepSWE | 69.6% | Coming soon | Coming soon |
| FrontierCode 1.1 Extended | 55.8% | Coming soon | Coming soon |
| cursorBench32 | 64.9% | Coming soon | Coming soon |
| VulcanBench v3 | 87.0% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 85.9% | 85.9% | Tie |
| SWE-bench (Vals) | 95.4% | 82.2% | GPT-5.6 Terra |
| cursorBench40 | 41.3% | Coming soon | Coming soon |
| SWE-bench Verified | Coming soon | 80.2% | Coming soon |
| SciCode | Coming soon | 48.7% | Coming soon |

### Multimodal & Grounded

- Winner: Coming soon
- GPT-5.6 Terra public-lane score: 77.1 (#15/48)
- Inkling-Small public-lane score: 48.8 (#39/48)

| Benchmark | GPT-5.6 Terra | Inkling-Small | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 80.7% | 74% | GPT-5.6 Terra |
| MMMU-Pro w/ Python | 82% | Coming soon | Coming soon |
| CharXiv | Coming soon | 81.3% | Coming soon |
| CharXiv w/o tools | Coming soon | 77.4% | Coming soon |

### Reasoning

- Winner: Coming soon
- GPT-5.6 Terra public-lane score: 63.7 (#14/20)
- Inkling-Small public-lane score: 42.7 (Unranked · 3 rankable rows)

| Benchmark | GPT-5.6 Terra | Inkling-Small | Winner |
|-----------|-----------|-----------|--------|
| ARC-AGI-2 | 83.9% | 40.1% | GPT-5.6 Terra |
| ARC-AGI-3 | 0.8% | Coming soon | Coming soon |
| CritPt | Coming soon | 8.3% | Coming soon |

### Knowledge

- Winner: GPT-5.6 Terra
- GPT-5.6 Terra public-lane score: 69.2 (Supported · #16/183)
- Inkling-Small public-lane score: 56.5 (Supported · #46/183)

| Benchmark | GPT-5.6 Terra | Inkling-Small | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 92.9% | 89.5% | GPT-5.6 Terra |
| GPQA-D | 92.9% | 89.5% | 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% | 83.6% | GPT-5.6 Terra |
| MMLU-Pro (Vals) | 86.7% | 85.6% | GPT-5.6 Terra |
| HLE | Coming soon | 47.8% | Coming soon |
| HLE w/o tools | Coming soon | 31.6% | Coming soon |

### Instruction Following

- Winner: Coming soon
- GPT-5.6 Terra public-lane score: 87.1 (#34/123)
- Inkling-Small public-lane score: 89.6 (#25/123)

| Benchmark | GPT-5.6 Terra | Inkling-Small | Winner |
|-----------|-----------|-----------|--------|
| IFBench | Coming soon | 82.2% | Coming soon |

### Mathematics

- Winner: Coming soon
- GPT-5.6 Terra public-lane score: 97 (Unranked · 3 rankable rows)
- Inkling-Small public-lane score: 76.9 (Unranked · 2 rankable rows)

| Benchmark | GPT-5.6 Terra | Inkling-Small | Winner |
|-----------|-----------|-----------|--------|
| FrontierMath (legacy) | 84.9% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 84.900% | Coming soon | Coming soon |
| FrontierMath v2 (Tier 4) | 68.300% | Coming soon | Coming soon |
| AIME26 | Coming soon | 95.5% | Coming soon |
| HMMT Feb 2026 | Coming soon | 90.2% | Coming soon |

## FAQ

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

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

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

The widest category gap is in multimodal & grounded, where the averages are 77.1 for GPT-5.6 Terra and 48.8 for Inkling-Small.

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

GPT-5.6 Terra currently has 33 sourced benchmark scores on BenchLM.

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

Inkling-Small currently has 25 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-Small vs GPT-5.6 Sol](/compare/gpt-5-6-sol-vs-inkling-small)
- [GPT-5.6 Terra vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-gpt-5-6-terra)
- [Inkling-Small vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-inkling-small)

## Explore More

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