Model comparison
GLM-5.3-Flash vs Sonar Reasoning Pro
GLM-5.3-Flash has enough public results to be ranked (#41); Sonar Reasoning Pro does not yet, so treat this comparison as directional.
Last verified . 0 shared benchmarks.
PerplexitySummary
- GLM-5.3-Flash is cheaper at $0.15 / $0.50 per million input/output tokens, against $2 / $8 for Sonar Reasoning Pro.
- GLM-5.3-Flash accepts more context: 1M tokens versus 128K.
- GLM-5.3-Flash has downloadable open weights; the other is API-only.
Side by side
| GLM-5.3-Flash | Sonar Reasoning Pro | |
|---|---|---|
| Provider | Z.ai (Zhipu) | Perplexity |
| Noometry Index | 51.8 | — |
| Released | 2026-08-20 | 2024-01-01 |
| Weights | Open | Proprietary |
| Context window | 1M | 128K |
| Max output | 131K | 4K |
| Input $ / M tokens | $0.15 | $2 |
| Output $ / M tokens | $0.50 | $8 |
| Results tracked | 40 | 1 |
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Category by category
Coding Not comparable
GLM-5.3-Flash: 53.1 (#31), Sonar Reasoning Pro: —
| Benchmark | GLM-5.3-Flash | Sonar Reasoning Pro |
|---|---|---|
| DeepSWE | 63.4% | — |
| FrontierCode | 31.8% | — |
| CursorBench | 36.8% | — |
| LMArena WebDev | 1609 | — |
| FrontierSWE | 18.1% | — |
| SciCode | 51.6% | — |
| LMArena Coding | 1508 | — |
| ALE-Bench | 303.55 | — |
Agentic & Tool Use Not comparable
GLM-5.3-Flash: 34.2 (#47), Sonar Reasoning Pro: —
| Benchmark | GLM-5.3-Flash | Sonar Reasoning Pro |
|---|---|---|
| APEX-Agents | 52.8% | — |
| GDP.pdf | 14% | — |
| LMArena Search | — | 1139 |
Reasoning Not comparable
GLM-5.3-Flash: 48.0 (#42), Sonar Reasoning Pro: —
| Benchmark | GLM-5.3-Flash | Sonar Reasoning Pro |
|---|---|---|
| ARC-AGI-2 | 65.8% | — |
| ARC-AGI-1 | 91% | — |
| CritPt | 15.4% | — |
| Chess Puzzles | 14% | — |
| LMArena Hard Prompts | 1491 | — |
| Mystery Game Puzzles | 8% | — |
| Surface Evolver Bench | 52.5% | — |
| Bench to the Future 3 | 0.15 | — |
| Epoch Capabilities Index | 151.88 | — |
Math Not comparable
GLM-5.3-Flash: 53.3 (#47), Sonar Reasoning Pro: —
| Benchmark | GLM-5.3-Flash | Sonar Reasoning Pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 55.8% | — |
| FrontierMath Tier 4 | 17.1% | — |
| OTIS Mock AIME 2024-2025 | 93.9% | — |
| ProofBench | 21% | — |
| LMArena Math | 1500 | — |
Knowledge Not comparable
GLM-5.3-Flash: 58.4 (#36), Sonar Reasoning Pro: —
| Benchmark | GLM-5.3-Flash | Sonar Reasoning Pro |
|---|---|---|
| GPQA Diamond | 90.2% | — |
| LMArena Expert | 1513 | — |
Multimodal Not comparable
GLM-5.3-Flash: 42.8 (#27), Sonar Reasoning Pro: —
| Benchmark | GLM-5.3-Flash | Sonar Reasoning Pro |
|---|---|---|
| LMArena Vision | 1296 | — |
Multilingual Not comparable
GLM-5.3-Flash: 56.0 (#25), Sonar Reasoning Pro: —
| Benchmark | GLM-5.3-Flash | Sonar Reasoning Pro |
|---|---|---|
| LMArena Non-English | 1462 | — |
| LMArena Chinese | 1527 | — |
| LMArena French | 1496 | — |
| LMArena German | 1470 | — |
| LMArena Japanese | 1429 | — |
| LMArena Korean | 1446 | — |
| LMArena Russian | 1469 | — |
| LMArena Spanish | 1471 | — |
Instruction Following Not comparable
GLM-5.3-Flash: 77.5 (#20), Sonar Reasoning Pro: —
| Benchmark | GLM-5.3-Flash | Sonar Reasoning Pro |
|---|---|---|
| LMArena Instruction Following | 1478 | — |
Long Context Not comparable
GLM-5.3-Flash: 45.4 (#39), Sonar Reasoning Pro: —
| Benchmark | GLM-5.3-Flash | Sonar Reasoning Pro |
|---|---|---|
| LMArena Longer Query | 1482 | — |
Writing & Preference Not comparable
GLM-5.3-Flash: 65.3 (#50), Sonar Reasoning Pro: —
| Benchmark | GLM-5.3-Flash | Sonar Reasoning Pro |
|---|---|---|
| LMArena Text | 1471 | — |
| LMArena Creative Writing | 1442 | — |
| LMArena Multi-Turn | 1467 | — |
Frequently asked questions
Is GLM-5.3-Flash better than Sonar Reasoning Pro?
GLM-5.3-Flash has enough public results to be ranked (#41); Sonar Reasoning Pro does not yet, so treat this comparison as directional.
Which is cheaper, GLM-5.3-Flash or Sonar Reasoning Pro?
GLM-5.3-Flash is cheaper. It lists at $0.15 per million input tokens and $0.50 per million output tokens; Sonar Reasoning Pro lists at $2 and $8.
Which has the bigger context window?
GLM-5.3-Flash does, with 1M tokens against 128K.
How many benchmarks do GLM-5.3-Flash and Sonar Reasoning Pro share?
0 benchmarks have published results for both models. GLM-5.3-Flash has 40 scored results on Noometry and Sonar Reasoning Pro has 1.