GLM-5.1 vs GPT-5.6 Sol
Wins 1 of 7 areas
Following instructions
Wins 6 of 7 areas
Coding · Agents · Reasoning · Facts · Math · Long documents
GPT-5.6 Sol is the stronger all-rounder.GLM-5.1 is cheaper and better at following instructions.
Scores updated · 33 tests both models report · How we compare
Where each one wins
Tests won in each of the seven areas where both have results. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.
- AgentsCarrying out multi-step tasks on its own06GPT-5.6 Sol6 of 6 tests
- CodingWriting and fixing software05GPT-5.6 Sol5 of 5 tests
- ReasoningHard problems that need careful thinking04GPT-5.6 Sol4 of 4 tests
- MathCompetition and research-level math02GPT-5.6 Sol2 of 2 tests
- FactsGetting facts right instead of making them up12GPT-5.6 Sol2 of 3 tests
- Long documentsFinding answers in very long texts01GPT-5.6 Sol1 of 1 test
- Following instructionsDoing exactly what it is asked10GLM-5.11 of 1 test
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.
GLM-5.1 costs 76% less for the same work.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where GPT-5.6 Sol pulls ahead
- Unpublished advanced math problemsFrontierMath Tiers 1-3 (v2)+52.3points ahead
- Complex command-line tasks across many fieldsTerminal-Bench 4.0+37.9points ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+35.7points ahead
Where GLM-5.1 pulls ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+62.3points ahead
- Follows unfamiliar, precisely checkable instructionsIFBench+3.6points ahead
Every test, side by side
All 33 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGPT-5.6 Sol
- Terminal-Bench 2.1GPT-5.6 Sol by 26.261.888+26.2
- Terminal-Bench HardGPT-5.6 Sol by 22.743.265.9+22.7
- SciCodeGPT-5.6 Sol by 12.344.857.1+12.3
- LMArena · WebDevGPT-5.6 Sol by 111 rating points15091620+111 rating
- SWE-bench ProGPT-5.6 Sol by 6.258.464.6+6.2
AgentsGPT-5.6 Sol
- Terminal-Bench 4.0GPT-5.6 Sol by 37.9239.9+37.9
- τ-Bench V3 · BankingGPT-5.6 Sol by 30.713.644.3+30.7
- GDPValGPT-5.6 Sol by 24.63155.6+24.6
- AA IT-Bench SREGPT-5.6 Sol by 15.940.356.2+15.9
- MCP AtlasGPT-5.6 Sol by 11.871.883.6+11.8
- BrowseCompGPT-5.6 Sol by 11.179.390.4+11.1
ReasoningGPT-5.6 Sol
- CritPtGPT-5.6 Sol by 27.74.632.3+27.7
- Humanity's Last ExamGPT-5.6 Sol by 19.430.149.5+19.4
- SimpleBenchGPT-5.6 Sol by 9.755.164.8+9.7
- GPQA DiamondGPT-5.6 Sol by 7.386.894.1+7.3
FactsGPT-5.6 Sol
- AA-Omniscience · Non-hallucinationGLM-5.1 by 62.370.17.8+62.3
- AA-Omniscience · AccuracyGPT-5.6 Sol by 35.723.759.4+35.7
- SimpleQA VerifiedGPT-5.6 Sol by 35.73469.7+35.7
MathGPT-5.6 Sol
- FrontierMath Tiers 1-3 (v2)GPT-5.6 Sol by 52.336.889.1+52.3
- AIME 2026GPT-5.6 Sol by 4.695.399.9+4.6
Other results11 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.
- DeepSWEGPT-5.6 Sol by 54.71872.7+54.7
- Program BenchGLM-5.1 by 25.950.925+25.9
- AA Agentic IndexGPT-5.6 Sol by 25.325.250.5+25.3
- Artificial Analysis Coding IndexGPT-5.6 Sol by 21.655.877.4+21.6
- AA-OmniscienceGPT-5.6 Sol by 21.10.822+21.1
- AA IntelligenceGPT-5.6 Sol by 20.926.147+20.9
- ToolathlonGPT-5.6 Sol by 17.340.758+17.3
- PostTrainBenchGPT-5.6 Sol by 16.120.136.2+16.1
- CyberGymGPT-5.6 Sol by 15.868.784.5+15.8
- τ²-Bench Telecom (AA run)GLM-5.1 by 12.697.785.1+12.6
- HLE (with tools)GPT-5.6 Sol by 12.252.364.5+12.2
Questions people ask
Which is better, GLM-5.1 or GPT-5.6 Sol?
GPT-5.6 Sol wins six of the seven areas where both have results: coding, agents, reasoning, facts, math and long documents. GLM-5.1 wins following instructions, and costs 76% less.
Which is better for coding?
GPT-5.6 Sol. It wins 5 of the 5 coding tests both models report; GLM-5.1 wins none.
Which is cheaper?
GLM-5.1 costs $1.38 per million input tokens and $4.40 per million output tokens; GPT-5.6 Sol costs $4.00 and $20.00. That makes GLM-5.1 about 76% cheaper for the same work.
How do you compare the two?
We use the 33 benchmark tests both models have published scores on. The verdict counts the 22 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 11 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.