# GPT-5.6 Terra vs Muse Spark 1.2 > Side-by-side benchmark comparison for GPT-5.6 Terra and Muse Spark 1.2 across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks. - Canonical page: https://benchlm.ai/compare/gpt-5-6-terra-vs-muse-spark-1-2 - Last updated: September 18, 2026 - Shared sourced benchmarks: 5 - HTML indexing: indexable - Ranking lane: BenchAlign v5 ## Quick Verdict Pick GPT-5.6 Terra if you want the stronger benchmark profile. Muse Spark 1.2 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 70.28. - The clearest category separation is in reasoning, where the averages are 63.7 for GPT-5.6 Terra and 75.3 for Muse Spark 1.2. - The biggest single benchmark swing is DeepSWE in Coding, with scores of 69.6% and 59.3%. - Muse Spark 1.2 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 | Muse Spark 1.2 | |----------|----------|----------| | Creator | OpenAI | Meta | | Type | Proprietary | Proprietary | | Reasoning | Reasoning | Reasoning | | Context | 1.05M | 1M | | Overall Score | 71.13 | 70.28 | | Benchmarks Covered | 33 | 8 | | Pricing (input/output) | $2.00 / $12.00 | $1.25 / $4.25 | ## Category Breakdown ### Agentic - Winner: Muse Spark 1.2 - GPT-5.6 Terra public-lane score: 60.4 (Supported · #18/154) - Muse Spark 1.2 public-lane score: 61 (Supported · #16/154) | Benchmark | GPT-5.6 Terra | Muse Spark 1.2 | Winner | |-----------|-----------|-----------|--------| | Terminal-Bench 3.0 | 20.8% | Coming soon | Coming soon | | Terminal-Bench 2.0 | 87.4% | Coming soon | Coming soon | | BrowseComp | 87.5% | Coming soon | Coming soon | | 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% | 69.7% | GPT-5.6 Terra | | ApprenticeBench | 16% | Coming soon | Coming soon | | Terminal-Bench 2.1 | Coming soon | 82.9% | Coming soon | ### Coding - Winner: GPT-5.6 Terra - GPT-5.6 Terra public-lane score: 67 (Supported · #8/154) - Muse Spark 1.2 public-lane score: 60 (Supported · #21/154) | Benchmark | GPT-5.6 Terra | Muse Spark 1.2 | Winner | |-----------|-----------|-----------|--------| | SWE-bench Pro | 63.4% | Coming soon | Coming soon | | Terminal-Bench 2.0 | 87.4% | Coming soon | Coming soon | | DeepSWE | 69.6% | 59.3% | GPT-5.6 Terra | | FrontierCode 1.1 Extended | 55.8% | Coming soon | Coming soon | | cursorBench32 | 64.9% | Coming soon | Coming soon | | VulcanBench v3 | 87.0% | 87.0% | Tie | | LiveCodeBench (Vals) | 85.9% | Coming soon | Coming soon | | SWE-bench (Vals) | 95.4% | 86.6% | GPT-5.6 Terra | | cursorBench40 | 41.3% | Coming soon | Coming soon | | Terminal-Bench 2.1 | Coming soon | 82.9% | Coming soon | | FrontierSWE v2 | Coming soon | 12.0% | Coming soon | ### Multimodal & Grounded - Winner: Coming soon - GPT-5.6 Terra public-lane score: 77.2 (#15/48) - Muse Spark 1.2 public-lane score: Coming soon | Benchmark | GPT-5.6 Terra | Muse Spark 1.2 | Winner | |-----------|-----------|-----------|--------| | MMMU-Pro | 80.7% | Coming soon | Coming soon | | MMMU-Pro w/ Python | 82% | Coming soon | Coming soon | ### Reasoning - Winner: Coming soon - GPT-5.6 Terra public-lane score: 63.7 (#14/20) - Muse Spark 1.2 public-lane score: 75.3 (Unranked · 2 rankable rows) | Benchmark | GPT-5.6 Terra | Muse Spark 1.2 | Winner | |-----------|-----------|-----------|--------| | ARC-AGI-2 | 83.9% | Coming soon | Coming soon | | ARC-AGI-3 | 0.8% | Coming soon | Coming soon | ### Knowledge - Winner: Coming soon - GPT-5.6 Terra public-lane score: 69.3 (Supported · #15/184) - Muse Spark 1.2 public-lane score: 70.7 (Estimated · #10/184) | Benchmark | GPT-5.6 Terra | Muse Spark 1.2 | Winner | |-----------|-----------|-----------|--------| | GPQA | 92.9% | Coming soon | Coming soon | | GPQA-D | 92.9% | Coming soon | Coming soon | | 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% | Coming soon | Coming soon | | MMLU-Pro (Vals) | 86.7% | 88.3% | Muse Spark 1.2 | ### Instruction Following - Winner: Coming soon - GPT-5.6 Terra public-lane score: 85.7 (#35/124) - Muse Spark 1.2 public-lane score: Coming soon ### Mathematics - Winner: Coming soon - GPT-5.6 Terra public-lane score: 96.8 (Unranked · 3 rankable rows) - Muse Spark 1.2 public-lane score: Coming soon | Benchmark | GPT-5.6 Terra | Muse Spark 1.2 | 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 | ## FAQ ### Which is better overall, GPT-5.6 Terra or Muse Spark 1.2? GPT-5.6 Terra is ahead overall on BenchLM right now. ### Where is the biggest gap between GPT-5.6 Terra and Muse Spark 1.2? The widest category gap is in reasoning, where the averages are 63.7 for GPT-5.6 Terra and 75.3 for Muse Spark 1.2. ### 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 Muse Spark 1.2 cover on BenchLM? Muse Spark 1.2 currently has 8 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) - [Muse Spark 1.2 vs GPT-5.6 Sol](/compare/gpt-5-6-sol-vs-muse-spark-1-2) - [GPT-5.6 Terra vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-gpt-5-6-terra) - [Muse Spark 1.2 vs GPT-5.6 Luna](/compare/gpt-5-6-luna-vs-muse-spark-1-2) ## Explore More - [GPT-5.6 Terra profile](/models/gpt-5-6-terra) - [Muse Spark 1.2 profile](/models/muse-spark-1-2) - [Compare Pricing](/llm-pricing) - [Alternative Finder](/tools/alternative-finder) - [LLM Selector](/tools/llm-selector) - [Overall Rankings](/best/overall)