Models, measured side by side
Claude Opus 5.5 vs GPT-5.2 Pro
Compare Claude Opus 5.5, GPT-5.2 Pro by token pricing, context length, benchmark results, speed and tool support.
Monthly workload
Monthly cost breakdown
InputOutput
Claude Opus 5.5
$180 / mo
GPT-5.2 Pro
$1,260 / mo
Performance comparison
Claude Opus 5.5
57.6
GPT-5.2 Pro
Not listed
Overview
Pricing & capacity
| Pricing & capacity | Claude Opus 5.5 | GPT-5.2 Pro |
|---|---|---|
| Input / 1M tokens | $4.00 | $21 |
| Output / 1M tokens | $20 | $168 |
| Cached input / 1M | $0.20 | Not listed |
| Monthly cost | $180 | $1,260 |
| Context window | 1M | 400K |
| Maximum output | 128K | 128K |
Input / 1M tokens
- Claude Opus 5.5
- $4.00
- GPT-5.2 Pro
- $21
Output / 1M tokens
- Claude Opus 5.5
- $20
- GPT-5.2 Pro
- $168
Cached input / 1M
- Claude Opus 5.5
- $0.20
- GPT-5.2 Pro
- Not listed
Monthly cost
- Claude Opus 5.5
- $180
- GPT-5.2 Pro
- $1,260
Context window
- Claude Opus 5.5
- 1M
- GPT-5.2 Pro
- 400K
Maximum output
- Claude Opus 5.5
- 128K
- GPT-5.2 Pro
- 128K
Benchmarks & performance
| Benchmarks & performance | Claude Opus 5.5 | GPT-5.2 Pro |
|---|---|---|
| Arena Elo | Not listed | 1,255 |
| MMLU-Pro | Not listed | 82.8% |
| Intelligence Index | 57.6 | Not listed |
| GPQA | Not listed | Not listed |
| Humanity’s Last Exam | 61.4% | Not listed |
| SciCode | 66.9% | Not listed |
| Output speed | 91 tokens/s | Not listed |
| Time to first token | 755.54 s | Not listed |
| DesignArena rating | 1,407 | Not listed |
| DesignArena win rate | 65.3% | Not listed |
Arena Elo
- Claude Opus 5.5
- Not listed
- GPT-5.2 Pro
- 1,255
MMLU-Pro
- Claude Opus 5.5
- Not listed
- GPT-5.2 Pro
- 82.8%
Intelligence Index
- Claude Opus 5.5
- 57.6
- GPT-5.2 Pro
- Not listed
GPQA
- Claude Opus 5.5
- Not listed
- GPT-5.2 Pro
- Not listed
Humanity’s Last Exam
- Claude Opus 5.5
- 61.4%
- GPT-5.2 Pro
- Not listed
SciCode
- Claude Opus 5.5
- 66.9%
- GPT-5.2 Pro
- Not listed
Output speed
- Claude Opus 5.5
- 91 tokens/s
- GPT-5.2 Pro
- Not listed
Time to first token
- Claude Opus 5.5
- 755.54 s
- GPT-5.2 Pro
- Not listed
DesignArena rating
- Claude Opus 5.5
- 1,407
- GPT-5.2 Pro
- Not listed
DesignArena win rate
- Claude Opus 5.5
- 65.3%
- GPT-5.2 Pro
- Not listed
Tools & features
| Tools & features | Claude Opus 5.5 | GPT-5.2 Pro |
|---|---|---|
| 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 | Not listed |
| Deterministic seed | Not listed | Supported |
| Parallel tool calls | Not listed | Not listed |
| Prompt caching | Supported | Not listed |
Function calling
- Claude Opus 5.5
- Supported
- GPT-5.2 Pro
- Supported
Structured outputs
- Claude Opus 5.5
- Supported
- GPT-5.2 Pro
- Supported
JSON mode
- Claude Opus 5.5
- Supported
- GPT-5.2 Pro
- Supported
Reasoning
- Claude Opus 5.5
- Supported
- GPT-5.2 Pro
- Supported
Built-in web search
- Claude Opus 5.5
- Not listed
- GPT-5.2 Pro
- Not listed
Log probabilities
- Claude Opus 5.5
- Not listed
- GPT-5.2 Pro
- Not listed
Deterministic seed
- Claude Opus 5.5
- Not listed
- GPT-5.2 Pro
- Supported
Parallel tool calls
- Claude Opus 5.5
- Not listed
- GPT-5.2 Pro
- Not listed
Prompt caching
- Claude Opus 5.5
- Supported
- GPT-5.2 Pro
- Not listed
API & availability
| API & availability | Claude Opus 5.5 | GPT-5.2 Pro |
|---|---|---|
| API identifier | claude-opus-5.5 | gpt-5.2-pro |
| API providers | Not listed | OpenAI |
| Knowledge cutoff | Not listed | Not listed |
| Prices checked | Oct 8, 2026 | Oct 8, 2026 |
API identifier
- Claude Opus 5.5
claude-opus-5.5- GPT-5.2 Pro
gpt-5.2-pro
API providers
- Claude Opus 5.5
- Not listed
- GPT-5.2 Pro
- OpenAI
Knowledge cutoff
- Claude Opus 5.5
- Not listed
- GPT-5.2 Pro
- Not listed
Prices checked
- Claude Opus 5.5
- Oct 8, 2026
- GPT-5.2 Pro
- 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 & detailsGPT-5.2 Pro
GPT-5.2 with extra compute for the most demanding problems. No cached-input discount.
Full pricing & detailsComparison FAQ
Claude Opus 5.5: $4.00 input and $20 output per million tokens. GPT-5.2 Pro: $21 input and $168 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.