AI model comparison
GLM 5.3 Flash vs Claude Opus 5
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
- $0.15
- Output / 1M
- $0.50
- Context
- 1.05M
Anthropic
Claude Opus 5
Claude Opus 5 is Anthropic’s flagship model for demanding reasoning, coding, and long-horizon agentic work.
- Input / 1M
- $5
- Output / 1M
- $25
- Context
- 1M
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
GLM 5.3 Flash
40.9x cheaper for a typical chat
Higher intelligence score
Claude Opus 5
50.8 vs 41.8 on Artificial Analysis
Larger context window
GLM 5.3 Flash
1.05M vs 1M tokens
Newer release
GLM 5.3 Flash
Released August 26, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
Claude Opus 550.8Coding index
Claude Opus 578Agentic index
Claude Opus 556.5Pricing
GLM 5.3 Flash vs Claude Opus 5 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | Claude Opus 5 | |
|---|---|---|
| Input tokensPer 1M tokens | $0.15 | $5 |
| Output tokensPer 1M tokens | $0.50 | $25 |
| Cached input (read)Per 1M tokens | $0.03 | $0.50 |
| Cache writePer 1M tokens | Not available | $6.25 |
| 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
Claude Opus 5$22.50Coding task
30K in, 4K out
Claude Opus 5$250$115 cachedLong document summary
150K in, 2K out
Claude Opus 5$800$125 cachedSpecs
Context window and capabilities
How much each model can read, how much it can write, and what it accepts as input.
| Metric | Claude Opus 5 | |
|---|---|---|
| Context window | 1.05M tokens | 1M 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 |
| Default reasoning effort | Max | High |
| Release date | August 26, 2026 | July 24, 2026 |
Features
Supported features
API features available for each model.
| Metric | Claude Opus 5 | |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Supported | Not supported |
| Stop sequences | Supported | Supported |
| Deterministic seed | Supported | Not 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 Hy4 preview
- GLM 5.3 Flash vs GPT-6 Luna
- GLM 5.3 Flash vs DeepSeek V4 Flash 0731
- GLM 5.3 Flash vs Claude Opus 5.5
- GLM 5.3 Flash vs GLM 5.3
- GLM 5.3 Flash vs DeepSeek V4 Flash 0423
- GLM 5.3 Flash vs Step 5 Preview
- GLM 5.3 Flash vs Gemini 3.8 Flash
- GLM 5.3 Flash vs Hy3
- GLM 5.3 Flash vs GPT-5.6 Luna
- GLM 5.3 Flash vs GPT-6.1 Sol
- GLM 5.3 Flash vs Muse Spark 1.3 Contributor
- GLM 5.3 Flash vs Claude Sonnet 5.5
- 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 DeepSeek V4 Pro 0813
- GLM 5.3 Flash vs Claude Haiku 5.5
- GLM 5.3 Flash vs Ling 3.1 Flash
- GLM 5.3 Flash vs GPT-6 Luna Pro
- 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 Qwen3.7 Flash
- GLM 5.3 Flash vs DeepSeek V4 Flash Vision Exp
- GLM 5.3 Flash vs Mistral Nemo
- GLM 5.3 Flash vs GLM 5.3 FlashX
- GLM 5.3 Flash vs GPT-5.6 Luna Pro
Claude Opus 5View full model details- Claude Opus 5 vs Claude Opus 5.5
- Claude Opus 5 vs Claude Sonnet 5.5
- Claude Opus 5 vs Claude Fable 5.1
- Claude Opus 5 vs GPT-6 Astra
- Claude Opus 5 vs GPT-6.1 Sol
- Claude Opus 5 vs Claude Fable 5
- Claude Opus 5 vs Muse Spark 1.3
- Claude Opus 5 vs GPT-6 Sol
- Claude Opus 5 vs GPT-5.6 Sol
- Claude Opus 5 vs Kimi K3
- Claude Opus 5 vs Claude Opus 4.8
- Claude Opus 5 vs DeepSeek V4.1 Flash
- Claude Opus 5 vs Claude Opus 4.7
- Claude Opus 5 vs MiMo-V2.6-Flash
- Claude Opus 5 vs Hy4 preview
- Claude Opus 5 vs GPT-6 Luna
- Claude Opus 5 vs DeepSeek V4 Flash 0731
Our take
GLM 5.3 Flash is 40.9x cheaper for a typical chat. Claude Opus 5 scores higher on the Artificial Analysis Intelligence Index (50.8 vs 41.8). GLM 5.3 Flash has the larger context window (1.05M vs 1M 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 Claude Opus 5 cheaper?
GLM 5.3 Flash is cheaper for a typical chat (2K input tokens and 500 output tokens). GLM 5.3 Flash costs $0.15 per 1M input tokens and $0.50 per 1M output tokens, while Claude Opus 5 costs $5 per 1M input tokens and $25 per 1M output tokens.
Which has a bigger context window, GLM 5.3 Flash or Claude Opus 5?
GLM 5.3 Flash supports up to 1.05M tokens of context, compared with 1M for Claude Opus 5.
Is GLM 5.3 Flash smarter than Claude Opus 5?
On the Artificial Analysis Intelligence Index, GLM 5.3 Flash scores 41.8 and Claude Opus 5 scores 50.8, putting Claude Opus 5 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 Claude Opus 5 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see GLM 5.3 Flash and Claude Opus 5 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to GLM 5.3 Flash and Claude Opus 5 at the same time. Compare the answers side by side and keep the best one.