DeepSeek V4.1 Flash vs GLM-5.3
| Spec | DeepSeek V4.1 Flash | GLM-5.3 |
|---|---|---|
| Respan Index | 52.0 (#28) | 52.0 (#28) |
| Blended price per 1M | $0.071 | $0.408 |
| Context window | 1M | 1M |
| Input / output per 1M | $0.045 / $0.15 | $0.078 / $1.4 |
| Max output | 384K | 131K |
| Input | text, vision | text |
| Released | 2026-09-10 | 2026-08-18 |
Respan Index by category
Each category is scored 0 to 100, and how far ahead the winner is. Leads under a point are close to even.
| Category | DeepSeek V4.1 Flash | GLM-5.3 |
|---|---|---|
| Coding | 39.7 DeepSeek V4.1 Flash | 44.5 GLM-5.3 |
| Agents | 60.0 DeepSeek V4.1 Flash | 64.0 GLM-5.3 |
| Reasoning | 56.0 DeepSeek V4.1 Flash | 48.8 GLM-5.3 |
| Knowledge & language | 44.5 DeepSeek V4.1 Flash | 42.3 GLM-5.3 |
| Human preference | 57.6 DeepSeek V4.1 Flash | 56.6 GLM-5.3 |
Benchmarks both report
DeepSeek V4.1 Flash leads on 16 of the 22 benchmarks both report. Higher is better. Each score links to where it was published.
| Benchmark | DeepSeek V4.1 Flash | GLM-5.3 |
|---|---|---|
| APEX-Agents (Mercor) | 39.5% | 56.6% |
| FrontierMath Tier 4 v2 (Epoch AI) | 26.8% | 29.3% |
| FrontierMath Tiers 1-3 v2 (Epoch AI) | 67.4% | 68.8% |
| GPQA Diamond | 90.9% | 90.9% |
| Mystery Game Puzzles (Epoch AI) | 43% | 33% |
| OTIS Mock AIME 2024-2025 (Epoch AI) | 98.3% | 91.1% |
| Terminal-Bench 4.0 (Vals AI) | 19.7% | 38.9% |
| Chess Puzzles (Epoch AI) | 48% | 37% |
| LMArena Agent (LMArena) | 0.0267 | 0.0091 |
| LMArena Elo | 1476 | 1481 |
| LMArena WebDev (LMArena) | 1665 | 1623 |
| SimpleQA Verified | 42.9% | 41% |
| LiveBench Agentic Coding (LiveBench) | 77.3% | 60.9% |
| LiveBench Coding (LiveBench) | 80% | 79% |
| LiveBench Data Analysis (LiveBench) | 79.3% | 70.2% |
| LiveBench Instruction Following (LiveBench) | 70% | 69.3% |
| LiveBench Language (LiveBench) | 81.2% | 79.9% |
| LiveBench Mathematics (LiveBench) | 93.3% | 87.9% |
| LiveBench Reasoning (LiveBench) | 86.7% | 85.8% |
| SimpleBench (SimpleBench) | 66.7% | 66.2% |
| DeepSWE v1.1 | 74.2% | 66.9% |
| Terminal-Bench 2.1 | 90.6% | 88.2% |
FAQ
Is DeepSeek V4.1 Flash better than GLM-5.3?
DeepSeek V4.1 Flash and GLM-5.3 tie on the Respan Index at 52.0. DeepSeek V4.1 Flash leads on 16 of the 22 benchmarks both report.
Which is cheaper, DeepSeek V4.1 Flash or GLM-5.3?
DeepSeek V4.1 Flash lists at $0.045 input and $0.15 output per 1M tokens; GLM-5.3 at $0.078 and $1.4. DeepSeek V4.1 Flash is 5.7x cheaper per token at list price.
Which has the larger context window?
Both accept 1M tokens of context.