GPT-5.6 Terra vs Muse Spark 1.2
Wins 3 of 8 areas
Agents · Math · Long documents
Wins 4 of 8 areas
Coding · Facts · Images and charts · Following instructions
Muse Spark 1.2 wins more areas, narrowly.GPT-5.6 Terra is better at agents.
Scores updated · 30 tests both models report · How we compare
Where each one wins
Tests won in each of the eight areas we test. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.
- CodingWriting and fixing software13Muse Spark 1.23 of 5 tests · 1 tie
- FactsGetting facts right instead of making them up12Muse Spark 1.22 of 3 tests
- Images and chartsUnderstanding pictures, charts and video01Muse Spark 1.21 of 1 test
- Following instructionsDoing exactly what it is asked01Muse Spark 1.21 of 1 test
- AgentsCarrying out multi-step tasks on its own21GPT-5.6 Terra2 of 3 tests
- MathCompetition and research-level math10GPT-5.6 Terra1 of 1 test
- Long documentsFinding answers in very long texts10GPT-5.6 Terra1 of 1 test
- ReasoningHard problems that need careful thinking22Even2 each · 1 tie
Images and charts, math, long documents and following instructions rest on a single test each.
What it costs
Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.
Muse Spark 1.2 costs 61% less for the same work.
The biggest differences
The three tests each model wins by the widest margin. Scores are out of 100.
Where Muse Spark 1.2 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+54.6points ahead
- Common-sense trick questionsSimpleBench+25.6points ahead
- Short factual questions, answered correctlySimpleQA Verified+17.1points ahead
Where GPT-5.6 Terra pulls ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+28.3points ahead
- Research-level physics problemsCritPt+12.3points ahead
- Command-line tasks in a real terminalTerminal-Bench 2.1+7.9points ahead
Every test, side by side
All 30 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingMuse Spark 1.2
- Terminal-Bench 2.1GPT-5.6 Terra by 7.98880.1+7.9
- LiveBench · Agentic CodingMuse Spark 1.2 by 2.65557.6+2.6
- SciCodeMuse Spark 1.2 by 2.45557.4+2.4
- LMArena · WebDevMuse Spark 1.2 by 10 rating points15221532+10 rating
- LiveBench · Codingtie78.377.5tie
AgentsGPT-5.6 Terra
- Terminal-Bench 4.0GPT-5.6 Terra by 28.335.47.1+28.3
- τ-Bench V3 · BankingGPT-5.6 Terra by 5.440.234.8+5.4
- GDPValMuse Spark 1.2 by 1.247.748.9+1.2
ReasoningEven
- SimpleBenchMuse Spark 1.2 by 25.648.974.5+25.6
- CritPtGPT-5.6 Terra by 12.33017.7+12.3
- Humanity's Last ExamMuse Spark 1.2 by 2.642.945.5+2.6
- GPQA DiamondGPT-5.6 Terra by 2.192.590.4+2.1
- LiveBench · Reasoningtie90.690tie
FactsMuse Spark 1.2
- AA-Omniscience · Non-hallucinationMuse Spark 1.2 by 54.612.166.7+54.6
- SimpleQA VerifiedMuse Spark 1.2 by 17.143.260.3+17.1
- AA-Omniscience · AccuracyGPT-5.6 Terra by 1.446.845.4+1.4
Images and chartsMuse Spark 1.2
- LMArena · VisionMuse Spark 1.2 by 34 rating points12711305+34 rating
Following instructionsMuse Spark 1.2
- LiveBench · Instruction FollowingMuse Spark 1.2 by 9.764.674.3+9.7
Other results10 tests, not counted
Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.
- AA-OmniscienceMuse Spark 1.2 by 27.10.127.2+27.1
- DeepSWE 1.1GPT-5.6 Terra by 10.77059.3+10.7
- GDPval-AA v2 EloMuse Spark 1.2 by 100 rating points15281628+100 rating
- GDP (Surge AI)GPT-5.6 Terra by 8.724.716+8.7
- Artificial Analysis Coding IndexGPT-5.6 Terra by 4.576.772.2+4.5
- livebench_languageGPT-5.6 Terra by 4.382.978.6+4.3
- livebench_data_analysisGPT-5.6 Terra by 2.879.376.5+2.8
- AA IntelligenceGPT-5.6 Terra by 2.542.139.6+2.5
- Code Arena (Elo)Muse Spark 1.2 by 12 rating points15231535+12 rating
- AA Agentic Indextie43.744tie
Questions people ask
Which is better, GPT-5.6 Terra or Muse Spark 1.2?
Muse Spark 1.2 wins four of the eight areas we test: coding, facts, images and charts and following instructions. GPT-5.6 Terra wins agents, math and long documents. They are level on reasoning.
Which is better for coding?
Muse Spark 1.2. It wins 3 of the 5 coding tests both models report; GPT-5.6 Terra wins 1, and 1 is a tie.
Which is cheaper?
GPT-5.6 Terra costs $2.00 per million input tokens and $12.00 per million output tokens; Muse Spark 1.2 costs $1.25 and $4.25. That makes Muse Spark 1.2 about 61% cheaper for the same work.
How do you compare the two?
We use the 30 benchmark tests both models have published scores on. The verdict counts the 20 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 10 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.