AI model comparison
GLM 5.3 Flash vs GPT-5.6 Terra
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
Z.ai
GLM 5.3 Flash
GLM-5.3-Flash is a native multimodal model from Z.ai. It is suited for efficient coding and long-horizon agent tasks.
- Input / 1M
- $0.02
- Output / 1M
- $1.20
- Context
- 1.05M
OpenAI
GPT-5.6 Terra
GPT-5.6 Terra is a balanced model in OpenAI's GPT-5.6 series, positioned between the flagship Sol tier and the cost-efficient Luna tier.
- Input / 1M
- $2
- Output / 1M
- $12
- Context
- 1.05M
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
GLM 5.3 Flash
15.5x cheaper for a typical chat
Higher intelligence score
GPT-5.6 Terra
42.1 vs 41.8 on Artificial Analysis
Larger context window
GPT-5.6 Terra
1.05M vs 1.05M tokens
Newer release
GLM 5.3 Flash
Released August 26, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
GPT-5.6 Terra42.1Coding index
GPT-5.6 Terra76.7Agentic index
GPT-5.6 Terra43.2Pricing
GLM 5.3 Flash vs GPT-5.6 Terra API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | GPT-5.6 Terra | |
|---|---|---|
| Input tokensPer 1M tokens | $0.02 | $2 |
| Output tokensPer 1M tokens | $1.20 | $12 |
| Cached input (read)Per 1M tokens | $0.02 | $0.20 |
| Cache writePer 1M tokens | Not available | $2.50 |
| Long-context pricingPer 1M tokens, for very long prompts | Same rate at any length | $4 in / $18 out above 272K |
| Web searchPer request | Not available | $0.01 |
What it costs in practice
Estimated cost per 1,000 requests at standard rates. Coding and long-document figures also show the cost when the input is already cached.
Chat message
2K in, 500 out
GPT-5.6 Terra$10Coding task
30K in, 4K out
GPT-5.6 Terra$108$54 cachedLong document summary
150K in, 2K out
GPT-5.6 Terra$324$54 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | GPT-5.6 Terra | |
|---|---|---|
| Context window | 1.05M tokens | 1.05M tokens |
| Max output | 944K tokens | 128K tokens |
| Input types | Image, Text, Video | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | Max, High, Low | Max, Extra high, High, Medium, Low, None |
| Default reasoning effort | Max | Medium |
| Release date | August 26, 2026 | July 9, 2026 |
Features
Supported features
API features available for each model.
| Metric | GPT-5.6 Terra | |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Not supported |
| Stop sequences | Supported | Not supported |
| Deterministic seed | Supported | Supported |
| Verbosity control | Not supported | Supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
- GLM 5.3 Flash vs DeepSeek V4.1 Flash
- GLM 5.3 Flash vs MiMo-V2.6-Flash
- GLM 5.3 Flash vs Step 5 Preview
- GLM 5.3 Flash vs Hy4 preview
- GLM 5.3 Flash vs GPT-6 Luna
- GLM 5.3 Flash vs Claude Opus 5.5
- GLM 5.3 Flash vs DeepSeek V4 Flash 0731
- GLM 5.3 Flash vs GLM 5.3
- GLM 5.3 Flash vs DeepSeek V4 Flash 0423
- GLM 5.3 Flash vs Hy3
- GLM 5.3 Flash vs Claude Sonnet 5.5
- GLM 5.3 Flash vs Muse Spark 1.3 Contributor
- GLM 5.3 Flash vs Kimi K3
- GLM 5.3 Flash vs GPT-6.1 Sol
- GLM 5.3 Flash vs Gemini 3.8 Flash
- GLM 5.3 Flash vs GPT-5.6 Luna
- GLM 5.3 Flash vs GLM 5.2
- GLM 5.3 Flash vs Claude Fable 5.1
- GLM 5.3 Flash vs GPT-6 Astra
- GLM 5.3 Flash vs MiMo-V2.6-Pro
- GLM 5.3 Flash vs Claude Opus 5
- GLM 5.3 Flash vs DeepSeek V4 Pro 0813
- GLM 5.3 Flash vs Claude Haiku 5.5
- GLM 5.3 Flash vs Muse Spark 1.3
- GLM 5.3 Flash vs Grok 4.7
- GLM 5.3 Flash vs Qwen3.8 Max (0902)
- GLM 5.3 Flash vs Grok 4.6
- GLM 5.3 Flash vs Ling 3.1 Flash
- GLM 5.3 Flash vs Claude Opus 4.8
- GLM 5.3 Flash vs Claude Opus 4.7
- GLM 5.3 Flash vs Qwen3.8 2.4T A95B
- GLM 5.3 Flash vs Gemini 3.7 Flash
- GLM 5.3 Flash vs Muse Spark 1.2
- GLM 5.3 Flash vs Qwen3.8 Flash
- GLM 5.3 Flash vs Qwen3.8 27B
- GLM 5.3 Flash vs Grok 4.5
- GLM 5.3 Flash vs GPT-6 Luna Pro
- GLM 5.3 Flash vs DeepSeek V4 Flash Vision Exp
- GLM 5.3 Flash vs GLM 5.3 FlashX
- GLM 5.3 Flash vs GPT-5.6 Luna Pro
GPT-5.6 TerraView full model details- GPT-5.6 Terra vs GPT-6 Astra
- GPT-5.6 Terra vs GPT-6 Sol
- GPT-5.6 Terra vs GPT-5.6 Sol
- GPT-5.6 Terra vs GLM 5.3
- GPT-5.6 Terra vs Kimi K3
- GPT-5.6 Terra vs Claude Opus 4.8
- GPT-5.6 Terra vs Ling 3.1 Flash
- GPT-5.6 Terra vs Gemini 3.8 Flash
- GPT-5.6 Terra vs Claude Opus 4.7
- GPT-5.6 Terra vs GPT-5.4
- GPT-5.6 Terra vs GPT-5.5
- GPT-5.6 Terra vs Claude Sonnet 5
Our take
GLM 5.3 Flash is 15.5x cheaper for a typical chat. GPT-5.6 Terra scores higher on the Artificial Analysis Intelligence Index (42.1 vs 41.8). GPT-5.6 Terra has the larger context window (1.05M vs 1.05M tokens). The right pick depends on your workload, so the quickest way to settle it is to send the same prompt to both and compare.
FAQ
Frequently asked questions
Is GLM 5.3 Flash or GPT-5.6 Terra cheaper?
GLM 5.3 Flash is cheaper for a typical chat (2K input tokens and 500 output tokens). GLM 5.3 Flash costs $0.02 per 1M input tokens and $1.20 per 1M output tokens, while GPT-5.6 Terra costs $2 per 1M input tokens and $12 per 1M output tokens.
Which has a bigger context window, GLM 5.3 Flash or GPT-5.6 Terra?
GPT-5.6 Terra supports up to 1.05M tokens of context, compared with 1.05M for GLM 5.3 Flash.
Is GLM 5.3 Flash smarter than GPT-5.6 Terra?
On the Artificial Analysis Intelligence Index, GLM 5.3 Flash scores 41.8 and GPT-5.6 Terra scores 42.1, putting GPT-5.6 Terra ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use GLM 5.3 Flash and GPT-5.6 Terra at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see GLM 5.3 Flash and GPT-5.6 Terra answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to GLM 5.3 Flash and GPT-5.6 Terra at the same time. Compare the answers side by side and keep the best one.