Gemini 2.5 Pro vs GLM-4.5-Air
Wins 5 of 6 areas
Coding · Reasoning · Facts · Long documents · Following instructions
Wins 1 of 6 areas
Agents
Gemini 2.5 Pro is the stronger all-rounder.GLM-4.5-Air is cheaper and better at agents.
Scores updated · 33 tests both models report · How we compare
Where each one wins
Tests won in each of the six 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.
- CodingWriting and fixing software30Gemini 2.5 Pro3 of 3 tests
- ReasoningHard problems that need careful thinking30Gemini 2.5 Pro3 of 3 tests
- FactsGetting facts right instead of making them up30Gemini 2.5 Pro3 of 3 tests
- Long documentsFinding answers in very long texts10Gemini 2.5 Pro1 of 1 test
- Following instructionsDoing exactly what it is asked10Gemini 2.5 Pro1 of 1 test
- AgentsCarrying out multi-step tasks on its own02GLM-4.5-Air2 of 2 tests
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-4.5-Air costs 90% 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 Gemini 2.5 Pro pulls ahead
- Answers hard knowledge questions correctlyAA-Omniscience · Accuracy+22.8points ahead
- Reasons across sets of long documentsAA-LCR+22.3points ahead
- Code for real scientific research problemsSciCode+15.7points ahead
Where GLM-4.5-Air pulls ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+11.4points 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.
CodingGemini 2.5 Pro
- SciCodeGemini 2.5 Pro by 15.746.330.6+15.7
- Terminal-Bench HardGemini 2.5 Pro by 626.520.5+6
- SWE-bench VerifiedGemini 2.5 Pro by 5.663.257.6+5.6
AgentsGLM-4.5-Air
- BrowseCompGLM-4.5-Air by 11.49.921.3+11.4
- GDPValGLM-4.5-Air by 303+3
ReasoningGemini 2.5 Pro
- Humanity's Last ExamGemini 2.5 Pro by 11187+11
- GPQA DiamondGemini 2.5 Pro by 10.383.673.3+10.3
- CritPtGemini 2.5 Pro by 2.62.60+2.6
FactsGemini 2.5 Pro
- AA-Omniscience · AccuracyGemini 2.5 Pro by 22.83916.3+22.8
- Vectara HHEM hallucination ratelower is betterGemini 2.5 Pro by 2.379.3+2.3
- AA-Omniscience · Non-hallucinationGemini 2.5 Pro by 29.17.1+2
Following instructionsGemini 2.5 Pro
- IFBenchGemini 2.5 Pro by 11.148.737.6+11.1
Other results20 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-OmniscienceGemini 2.5 Pro by 45.2-16.4-61.5+45.2
- Artificial Analysis Coding IndexGemini 2.5 Pro by 22.946.723.8+22.9
- AA Agentic IndexGLM-4.5-Air by 17.53.521+17.5
- AIR-Bench 2024Gemini 2.5 Pro by 16.573.657.1+16.5
- TAU-bench (retail)GLM-4.5-Air by 10.96777.9+10.9
- TAU-bench (airline)GLM-4.5-Air by 10.85060.8+10.8
- HarmBenchGemini 2.5 Pro by 9.265.456.1+9.2
- τ²-Bench Telecom (AA run)Gemini 2.5 Pro by 7.654.146.5+7.6
- Terminal-BenchGLM-4.5-Air by 4.725.330+4.7
- MMLU-ProGemini 2.5 Pro by 4.68681.4+4.6
- AA IntelligenceGemini 2.5 Pro by 3.91511.1+3.9
- vectara_avg_summary_lengthGemini 2.5 Pro by 35.8 rating points106.470.6+35.8 rating
- LiveCodeBenchGemini 2.5 Pro by 3.574.270.7+3.5
- vectara_factual_consistencyGemini 2.5 Pro by 2.39390.7+2.3
- simple_safety_testsGLM-4.5-Air by 29799+2
- vectara_answer_rateGemini 2.5 Pro by 199.198.1+1
- MATH-500 (EM)tie98.898.1tie
- anthropic_red_teamtie99.599tie
- AIME 2025tie8383.3tie
- XSTesttie98.798.6tie
Questions people ask
Which is better, Gemini 2.5 Pro or GLM-4.5-Air?
Gemini 2.5 Pro wins five of the six areas where both have results: coding, reasoning, facts, long documents and following instructions. GLM-4.5-Air wins agents, and costs 90% less.
Which is better for coding?
Gemini 2.5 Pro. It wins 3 of the 3 coding tests both models report; GLM-4.5-Air wins none.
Which is cheaper?
Gemini 2.5 Pro costs $1.25 per million input tokens and $10.00 per million output tokens; GLM-4.5-Air costs $0.17 and $0.98. That makes GLM-4.5-Air about 90% 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 13 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 20 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.