AI model comparison
GPT-5.2-Codex vs Claude Opus 4.5
Pricing, context window, benchmarks, and features compared side by side. Or skip the guesswork and send one prompt to both.
OpenAI
GPT-5.2-Codex
GPT-5.2-Codex is an upgraded version of GPT-5.1-Codex optimized for software engineering and coding workflows.
- Input / 1M
- $1.75
- Output / 1M
- $14
- Context
- 400K
Anthropic
Claude Opus 4.5
Claude Opus 4.5 is Anthropic’s frontier reasoning model optimized for complex software engineering, agentic workflows, and long-horizon computer use.
- Input / 1M
- $5
- Output / 1M
- $25
- Context
- 200K
At a glance
Quick verdict
How the two models stack up on the things people ask about most.
Lower price
GPT-5.2-Codex
2.1x cheaper for a typical chat
Higher intelligence score
Claude Opus 4.5
29.1 vs 28.5 on Artificial Analysis
Larger context window
GPT-5.2-Codex
400K vs 200K tokens
Newer release
GPT-5.2-Codex
Released January 14, 2026
Benchmarks
Benchmark scores
Independent scores from Artificial Analysis. Higher is better.
Intelligence index
GPT-5.2-Codex28.5Claude Opus 4.529.1Coding index
GPT-5.2-CodexNot availableClaude Opus 4.5Not availableAgentic index
GPT-5.2-CodexNot availableClaude Opus 4.5Not availablePricing
GPT-5.2-Codex vs Claude Opus 4.5 API pricing
Per-token API rates. Cheaper option highlighted.
| Metric | GPT-5.2-Codex | Claude Opus 4.5 |
|---|---|---|
| Input tokensPer 1M tokens | $1.75 | $5 |
| Output tokensPer 1M tokens | $14 | $25 |
| Cached input (read)Per 1M tokens | $0.18 | $0.50 |
| Cache writePer 1M tokens | Not available | $6.25 |
| Web searchPer request | $0.01 | $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-5.2-Codex$10.50Claude Opus 4.5$22.50Coding task
30K in, 4K out
GPT-5.2-Codex$108.50$61.25 cachedClaude Opus 4.5$250$115 cachedLong document summary
150K in, 2K out
GPT-5.2-Codex$290.50$54.25 cachedClaude Opus 4.5$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 | GPT-5.2-Codex | Claude Opus 4.5 |
|---|---|---|
| Context window | 400K tokens | 200K tokens |
| Max output | 128K tokens | 64K tokens |
| Input types | Image, Text | File, Image, Text |
| Output types | Text | Text |
| Reasoning effort levels | Extra high, High, Medium, Low | Not available |
| Default reasoning effort | Medium | Not available |
| Release date | January 14, 2026 | November 24, 2025 |
Features
Supported features
API features available for each model.
| Metric | GPT-5.2-Codex | Claude Opus 4.5 |
|---|---|---|
| Tool calling | Supported | Supported |
| Structured outputs | Supported | Supported |
| JSON mode | Supported | Supported |
| Reasoning | Supported | Supported |
| Temperature | Not supported | Supported |
| Stop sequences | Not supported | Supported |
| Deterministic seed | Supported | Not supported |
| Verbosity control | Supported | Supported |
Keep exploring
More on these models
Other head-to-heads, the full model page, and the alternatives list for each model.
Claude Opus 4.5View full model details- Claude Opus 4.5 vs Claude Sonnet 5
- Claude Opus 4.5 vs GLM 5.2
- Claude Opus 4.5 vs GPT-5.3-Codex
- Claude Opus 4.5 vs Claude Opus 4.6
- Claude Opus 4.5 vs GPT-5.2
- Claude Opus 4.5 vs Claude Sonnet 4.6
- Claude Opus 4.5 vs Gemini 3.1 Pro Preview
- Claude Opus 4.5 vs Qwen3.7 Max
- Claude Opus 4.5 vs Claude Opus 4.1
- Claude Opus 4.5 vs Claude Sonnet 4.5
Our take
GPT-5.2-Codex is 2.1x cheaper for a typical chat. Claude Opus 4.5 scores higher on the Artificial Analysis Intelligence Index (29.1 vs 28.5). GPT-5.2-Codex has the larger context window (400K vs 200K 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 GPT-5.2-Codex or Claude Opus 4.5 cheaper?
GPT-5.2-Codex is cheaper for a typical chat (2K input tokens and 500 output tokens). GPT-5.2-Codex costs $1.75 per 1M input tokens and $14 per 1M output tokens, while Claude Opus 4.5 costs $5 per 1M input tokens and $25 per 1M output tokens.
Which has a bigger context window, GPT-5.2-Codex or Claude Opus 4.5?
GPT-5.2-Codex supports up to 400K tokens of context, compared with 200K for Claude Opus 4.5.
Is GPT-5.2-Codex smarter than Claude Opus 4.5?
On the Artificial Analysis Intelligence Index, GPT-5.2-Codex scores 28.5 and Claude Opus 4.5 scores 29.1, putting Claude Opus 4.5 ahead. Benchmarks don't capture everything, so the best test is running your own prompts through both.
Can I use GPT-5.2-Codex and Claude Opus 4.5 at the same time?
Yes. Shortcut Chat sends one prompt to multiple models at once, so you can see GPT-5.2-Codex and Claude Opus 4.5 answer side by side and keep the better response.
Why choose? Ask both.
Send one prompt to GPT-5.2-Codex and Claude Opus 4.5 at the same time. Compare the answers side by side and keep the best one.