Models, measured side by side
Claude Opus 5.5 vs GLM 5.3
Compare Claude Opus 5.5, GLM 5.3 by token pricing, context length, benchmark results, speed and tool support.
Monthly workload
Monthly cost breakdown
InputOutput
Claude Opus 5.5
$180 / mo
GLM 5.3
$45 / mo
Performance comparison
Claude Opus 5.5
57.6
GLM 5.3
44.8
Overview
Pricing & capacity
| Pricing & capacity | Claude Opus 5.5 | GLM 5.3 |
|---|---|---|
| Input / 1M tokens | $4.00 | $1.40 |
| Output / 1M tokens | $20 | $3.39 |
| Cached input / 1M | $0.20 | $0.05 |
| Monthly cost | $180 | $45 |
| Context window | 1M | 1M |
| Maximum output | 128K | 944K |
Input / 1M tokens
- Claude Opus 5.5
- $4.00
- GLM 5.3
- $1.40
Output / 1M tokens
- Claude Opus 5.5
- $20
- GLM 5.3
- $3.39
Cached input / 1M
- Claude Opus 5.5
- $0.20
- GLM 5.3
- $0.05
Monthly cost
- Claude Opus 5.5
- $180
- GLM 5.3
- $45
Context window
- Claude Opus 5.5
- 1M
- GLM 5.3
- 1M
Maximum output
- Claude Opus 5.5
- 128K
- GLM 5.3
- 944K
Benchmarks & performance
| Benchmarks & performance | Claude Opus 5.5 | GLM 5.3 |
|---|---|---|
| Arena Elo | Not listed | Not listed |
| MMLU-Pro | Not listed | Not listed |
| Intelligence Index | 57.6 | 44.8 |
| GPQA | Not listed | 91.7% |
| Humanity’s Last Exam | 61.4% | 42.3% |
| SciCode | 66.9% | 59% |
| Output speed | 91 tokens/s | 72 tokens/s |
| Time to first token | 755.54 s | 2.73 s |
| DesignArena rating | 1,407 | Not listed |
| DesignArena win rate | 65.3% | Not listed |
Arena Elo
- Claude Opus 5.5
- Not listed
- GLM 5.3
- Not listed
MMLU-Pro
- Claude Opus 5.5
- Not listed
- GLM 5.3
- Not listed
Intelligence Index
- Claude Opus 5.5
- 57.6
- GLM 5.3
- 44.8
GPQA
- Claude Opus 5.5
- Not listed
- GLM 5.3
- 91.7%
Humanity’s Last Exam
- Claude Opus 5.5
- 61.4%
- GLM 5.3
- 42.3%
SciCode
- Claude Opus 5.5
- 66.9%
- GLM 5.3
- 59%
Output speed
- Claude Opus 5.5
- 91 tokens/s
- GLM 5.3
- 72 tokens/s
Time to first token
- Claude Opus 5.5
- 755.54 s
- GLM 5.3
- 2.73 s
DesignArena rating
- Claude Opus 5.5
- 1,407
- GLM 5.3
- Not listed
DesignArena win rate
- Claude Opus 5.5
- 65.3%
- GLM 5.3
- Not listed
Tools & features
| Tools & features | Claude Opus 5.5 | GLM 5.3 |
|---|---|---|
| Function calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Built-in web search | Not listed | Not listed |
| Log probabilities | Not listed | Supported |
| Deterministic seed | Not listed | Supported |
| Parallel tool calls | Not listed | Supported |
| Prompt caching | Supported | Supported |
Function calling
- Claude Opus 5.5
- Supported
- GLM 5.3
- Supported
Structured outputs
- Claude Opus 5.5
- Supported
- GLM 5.3
- Supported
JSON mode
- Claude Opus 5.5
- Supported
- GLM 5.3
- Supported
Reasoning
- Claude Opus 5.5
- Supported
- GLM 5.3
- Supported
Built-in web search
- Claude Opus 5.5
- Not listed
- GLM 5.3
- Not listed
Log probabilities
- Claude Opus 5.5
- Not listed
- GLM 5.3
- Supported
Deterministic seed
- Claude Opus 5.5
- Not listed
- GLM 5.3
- Supported
Parallel tool calls
- Claude Opus 5.5
- Not listed
- GLM 5.3
- Supported
Prompt caching
- Claude Opus 5.5
- Supported
- GLM 5.3
- Supported
API & availability
| API & availability | Claude Opus 5.5 | GLM 5.3 |
|---|---|---|
| API identifier | claude-opus-5.5 | glm-5.3 |
| API providers | Not listed | Not listed |
| Knowledge cutoff | Not listed | Not listed |
| Prices checked | Oct 8, 2026 | Oct 8, 2026 |
API identifier
- Claude Opus 5.5
claude-opus-5.5- GLM 5.3
glm-5.3
API providers
- Claude Opus 5.5
- Not listed
- GLM 5.3
- Not listed
Knowledge cutoff
- Claude Opus 5.5
- Not listed
- GLM 5.3
- Not listed
Prices checked
- Claude Opus 5.5
- Oct 8, 2026
- GLM 5.3
- Oct 8, 2026
About the models
Claude Opus 5.5
Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5. It is particularly strong at multi-step changes in large codebases, code...
Full pricing & detailsGLM 5.3
GLM-5.3 is a large-scale reasoning model from Z.ai, built for complex software engineering and long-horizon agent tasks. It supports text input and output with a 1M-token context window, and improves...
Full pricing & detailsComparison FAQ
Claude Opus 5.5: $4.00 input and $20 output per million tokens. GLM 5.3: $1.40 input and $3.39 output per million tokens. The cheaper choice depends on your input-to-output ratio; a model can have a lower input rate but a higher output rate.