# Claude Opus 4.5 vs GPT-5.6 Terra

> Side-by-side benchmark comparison for Claude Opus 4.5 and GPT-5.6 Terra across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/claude-opus-4-5-vs-gpt-5-6-terra
- Last updated: September 24, 2026

- Shared sourced benchmarks: 7
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.7

## Quick Verdict

Pick GPT-5.6 Terra if you want the stronger benchmark profile. Claude Opus 4.5 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 72.58 to 55.09.
- The clearest category separation is in instruction following, where the averages are 30.6 for Claude Opus 4.5 and 85.7 for GPT-5.6 Terra.
- The biggest single benchmark swing is FrontierMath v2 (Tiers 1-3) in Mathematics, with scores of 20.690% and 84.900%.
- GPT-5.6 Terra 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 | Claude Opus 4.5 | GPT-5.6 Terra |
|----------|----------|----------|
| Creator | Anthropic | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | 200K | 1.05M |
| Overall Score | 55.09 | 72.58 |
| Benchmarks Covered | 45 | 32 |
| Pricing (input/output) | $5.00 / $25.00 | $2.00 / $12.00 |

## Category Breakdown

### Agentic

- Winner: Directional only
- Claude Opus 4.5 public-lane score: 30.9 (Estimated · #65/105)
- GPT-5.6 Terra public-lane score: 59.5 (Supported · #18/105)

| Benchmark | Claude Opus 4.5 | GPT-5.6 Terra | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 59.3% | Coming soon | Coming soon |
| OSWorld-Verified | 66.3% | Coming soon | Coming soon |
| OSWorld | 66.3% | Coming soon | Coming soon |
| Claw-Eval | 59.6% | Coming soon | Coming soon |
| QwenClawBench | 52.3% | Coming soon | Coming soon |
| τ³-bench results | 70.2% | Coming soon | Coming soon |
| VITA-Bench | 23.3% | Coming soon | Coming soon |
| DeepPlanning | 26.4% | Coming soon | Coming soon |
| Toolathlon | 43.5% | 53.1% | GPT-5.6 Terra |
| MCP Atlas | 42.3% | Coming soon | Coming soon |
| MCP-Tasks | 71.8% | Coming soon | Coming soon |
| WideResearch | 76.4% | Coming soon | Coming soon |
| CyberGym | 50.6% | 81.8% | GPT-5.6 Terra |
| Gert Labs | 64.23% | Coming soon | Coming soon |
| JobBench | 32.3% | Coming soon | Coming soon |
| Terminal-Bench 3.0 | Coming soon | 20.8% | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 87.4% | Coming soon |
| BrowseComp | Coming soon | 87.5% | Coming soon |
| OSWorld 2.0 | Coming soon | 50.2% | Coming soon |
| ExploitGym | Coming soon | 23.2% | Coming soon |
| Terminal-Bench 2.1 (Vals) | Coming soon | 77.5% | Coming soon |
| ApprenticeBench | Coming soon | 16% | Coming soon |

### Coding

- Winner: Directional only
- Claude Opus 4.5 public-lane score: 43.5 (Estimated · #50/135)
- GPT-5.6 Terra public-lane score: 64.7 (Supported · #8/135)

| Benchmark | Claude Opus 4.5 | GPT-5.6 Terra | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 80.9% | Coming soon | Coming soon |
| LiveCodeBench v6 | 84.8% | Coming soon | Coming soon |
| SWE-bench Pro | 57.1% | 63.4% | GPT-5.6 Terra |
| SWE Multilingual | 77.5% | Coming soon | Coming soon |
| NL2Repo | 43.2% | Coming soon | Coming soon |
| Terminal-Bench 2.1 | Coming soon | 87.4% | Coming soon |
| DeepSWE | Coming soon | 69.6% | Coming soon |
| FrontierCode 1.1 Extended | Coming soon | 55.8% | Coming soon |
| cursorBench32 | Coming soon | 64.9% | Coming soon |
| VulcanBench v3 | Coming soon | 87.0% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 85.9% | Coming soon |
| SWE-bench (Vals) | Coming soon | 95.4% | Coming soon |

### Reasoning

- Winner: Not comparable
- Claude Opus 4.5 public-lane score: 73.2 (Unranked · 4 rankable rows)
- GPT-5.6 Terra public-lane score: 65.4 (#12/19)

| Benchmark | Claude Opus 4.5 | GPT-5.6 Terra | Winner |
|-----------|-----------|-----------|--------|
| LongBench v2 | 64.4% | Coming soon | Coming soon |
| AI-Needle | 74% | Coming soon | Coming soon |
| ARC-AGI-2 | Coming soon | 83.9% | Coming soon |
| ARC-AGI-3 | Coming soon | 0.8% | Coming soon |

### Multimodal & Grounded

- Winner: Directional only
- Claude Opus 4.5 public-lane score: 23.5 (#48/50)
- GPT-5.6 Terra public-lane score: 77.2 (#16/50)

| Benchmark | Claude Opus 4.5 | GPT-5.6 Terra | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | 70.6% | 80.7% | GPT-5.6 Terra |
| MathVision | 74.3% | Coming soon | Coming soon |
| CharXiv | 68.5% | Coming soon | Coming soon |
| VideoMMMU | 84.4% | Coming soon | Coming soon |
| ScreenSpot Pro | 45.7% | Coming soon | Coming soon |
| V* | 67.0% | Coming soon | Coming soon |
| MMMU-Pro w/ Python | Coming soon | 82% | Coming soon |

### Knowledge

- Winner: Directional only
- Claude Opus 4.5 public-lane score: 49.4 (Estimated · #58/158)
- GPT-5.6 Terra public-lane score: 71.1 (Supported · #9/158)

| Benchmark | Claude Opus 4.5 | GPT-5.6 Terra | Winner |
|-----------|-----------|-----------|--------|
| GPQA | 87% | 92.9% | GPT-5.6 Terra |
| SuperGPQA | 70.6% | Coming soon | Coming soon |
| MMLU-Pro | 89.5% | Coming soon | Coming soon |
| MMLU-Redux | 96.6% | Coming soon | Coming soon |
| C-Eval | 92.2% | Coming soon | Coming soon |
| HLE | 30.8% | Coming soon | Coming soon |
| GPQA-D | Coming soon | 92.9% | Coming soon |
| HLE-Verified | Coming soon | 51.1% | Coming soon |
| LABBench2 | Coming soon | 81.2% | Coming soon |
| HealthBench Professional | Coming soon | 57.7% | Coming soon |
| HealthBench Hard | Coming soon | 32.7% | Coming soon |
| GPQA Diamond (Vals) | Coming soon | 90.9% | Coming soon |
| MMLU-Pro (Vals) | Coming soon | 86.7% | Coming soon |

### Multilingual

- Winner: Not comparable
- Claude Opus 4.5 public-lane score: 82.9 (#2/12)
- GPT-5.6 Terra public-lane score: Coming soon

| Benchmark | Claude Opus 4.5 | GPT-5.6 Terra | Winner |
|-----------|-----------|-----------|--------|
| MMLU-ProX | 85.7% | Coming soon | Coming soon |
| NOVA-63 | 56.7% | Coming soon | Coming soon |

### Instruction Following

- Winner: Directional only
- Claude Opus 4.5 public-lane score: 30.6 (#114/124)
- GPT-5.6 Terra public-lane score: 85.7 (#35/124)

| Benchmark | Claude Opus 4.5 | GPT-5.6 Terra | Winner |
|-----------|-----------|-----------|--------|
| IFEval | 90.9% | Coming soon | Coming soon |
| IFBench | 58% | Coming soon | Coming soon |

### Mathematics

- Winner: Not comparable
- Claude Opus 4.5 public-lane score: 57.9 (#6/7)
- GPT-5.6 Terra public-lane score: 96.8 (Unranked · 3 rankable rows)

| Benchmark | Claude Opus 4.5 | GPT-5.6 Terra | Winner |
|-----------|-----------|-----------|--------|
| AIME26 | 95.1% | Coming soon | Coming soon |
| HMMT Feb 2025 | 92.9% | Coming soon | Coming soon |
| HMMT Nov 2025 | 93.3% | Coming soon | Coming soon |
| HMMT Feb 2026 | 85.3% | Coming soon | Coming soon |
| MMAnswerBench | 84.0% | Coming soon | Coming soon |
| FrontierMath v2 (Tiers 1-3) | 20.690% | 84.900% | GPT-5.6 Terra |
| FrontierMath v2 (Tier 4) | 4.167% | 68.300% | GPT-5.6 Terra |
| FrontierMath (legacy) | Coming soon | 84.9% | Coming soon |

## FAQ

### Which is better overall, Claude Opus 4.5 or GPT-5.6 Terra?

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

### Where is the biggest gap between Claude Opus 4.5 and GPT-5.6 Terra?

The widest category gap is in instruction following, where the averages are 30.6 for Claude Opus 4.5 and 85.7 for GPT-5.6 Terra.

### How many benchmarks does Claude Opus 4.5 cover on BenchLM?

Claude Opus 4.5 currently has 45 sourced benchmark scores on BenchLM.

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

GPT-5.6 Terra currently has 32 sourced benchmark scores on BenchLM.

## Related Comparisons

- [Claude Opus 4.5 vs Claude Opus 4.5 Thinking](/compare/claude-opus-4-5-vs-claude-opus-4-5-thinking)
- [GPT-5.6 Terra vs Claude Opus 4.5 Thinking](/compare/claude-opus-4-5-thinking-vs-gpt-5-6-terra)
- [Claude Opus 4.5 vs GPT-5.6 Sol](/compare/claude-opus-4-5-vs-gpt-5-6-sol)
- [GPT-5.6 Terra vs GPT-5.6 Sol](/compare/gpt-5-6-sol-vs-gpt-5-6-terra)

## Explore More

- [Claude Opus 4.5 profile](/models/claude-opus-4-5)
- [GPT-5.6 Terra profile](/models/gpt-5-6-terra)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)