| Signal | Claude Opus 4.5 | Delta | GPT-5.3-Codex |
|---|---|---|---|
Capabilities | 100 | -- | |
Benchmarks | 86 | +86 | |
Pricing | 25 | +11 | |
Context window size | 84 | -5 | |
Recency | 100 | -- | |
Output Capacity | 80 | -5 | |
| Overall Result | 2 wins | of 6 | 2 wins |
28
days ranked higher
2
days
0
days ranked higher
Anthropic
OpenAI
GPT-5.3-Codex saves you $875.00/month
That's $10500.00/year compared to Claude Opus 4.5 at your current usage level of 100K calls/month.
| Metric | Claude Opus 4.5 | GPT-5.3-Codex | Winner |
|---|---|---|---|
| Overall Score | 90 | 85 | Claude Opus 4.5 |
| Rank | #9 | #29 | Claude Opus 4.5 |
| Quality Rank | #9 | #29 | Claude Opus 4.5 |
| Adoption Rank | #9 | #29 | Claude Opus 4.5 |
| Parameters | -- | -- | -- |
| Context Window | 200K | 400K | GPT-5.3-Codex |
| Pricing | $5.00/$25.00/M | $1.75/$14.00/M | -- |
| Signal Scores | |||
| Capabilities | 100 | 100 | Claude Opus 4.5 |
| Benchmarks | 86 | -- | Claude Opus 4.5 |
| Pricing | 25 | 14 | Claude Opus 4.5 |
| Context window size | 84 | 89 | GPT-5.3-Codex |
| Recency | 100 | 100 | Claude Opus 4.5 |
| Output Capacity | 80 | 85 | GPT-5.3-Codex |
Our composite score (0–100) combines six weighted signals: benchmark performance (25%), pricing efficiency (25%), context window size (15%), model recency (15%), output capacity (10%), and capability versatility (10%). Here's what the scores mean for these two models:
Scores 90/100 (rank #9), placing it in the top 97% of all 290 models tracked.
Scores 85/100 (rank #29), placing it in the top 90% of all 290 models tracked.
Claude Opus 4.5 has a 5-point advantage, which typically translates to noticeably better performance on complex reasoning, code generation, and multi-step tasks.
GPT-5.3-Codex offers 48% better value per quality point. At 1M tokens/day, you'd spend $236.25/month with GPT-5.3-Codex vs $450.00/month with Claude Opus 4.5 - a $213.75 monthly difference.
Both models have comparable response speeds. For most applications, the latency difference is negligible.
When latency matters most: Interactive chatbots, IDE code completion, real-time translation, and user-facing applications where response time directly impacts experience. For batch processing, background summarization, or offline analysis, latency is less critical.
Code generation & review
Higher benchmark score (0/100) indicates stronger performance on coding tasks like generating functions, debugging, and refactoring
Customer support chatbot
Faster response time (speed score 0/100) is critical for user-facing chat. GPT-5.3-Codex also offers lower per-token costs for high-volume support
Long document analysis
Larger context window (400K tokens) can process longer documents, contracts, and research papers in a single pass
Batch data extraction
Lower output pricing ($14.00/M) reduces costs when processing thousands of records daily
Creative writing & content
Higher overall composite score (90/100) correlates with better nuance, coherence, and style in long-form content
Image understanding & OCR
Supports vision input - can analyze screenshots, diagrams, photos, and scanned documents directly
Claude Opus 4.5 has a moderate advantage with a 5.400000000000006-point lead in composite score. It wins on more signal dimensions, but GPT-5.3-Codex has specific strengths that could make it the better choice for certain workflows.
Best for Quality
Claude Opus 4.5
Marginally better benchmark scores; both are excellent
Best for Cost
GPT-5.3-Codex
48% lower pricing; better value at scale
Best for Reliability
Claude Opus 4.5
Higher uptime and faster response speeds
Best for Prototyping
Claude Opus 4.5
Stronger community support and better developer experience
Best for Production
Claude Opus 4.5
Wider enterprise adoption and proven at scale
by Anthropic
| Capability | Claude Opus 4.5 | GPT-5.3-Codex |
|---|---|---|
| Vision (Image Input) | ||
| Function Calling | ||
| Streaming | ||
| JSON Mode | ||
| Reasoning | ||
| Web Search | ||
| Image Output |
Anthropic
OpenAI
GPT-5.3-Codex saves you $19.05/month
That's 49% cheaper than Claude Opus 4.5 at 1,000 tokens/request and 100 requests/day.
Assumes 60% input / 40% output token ratio per request. Actual costs may vary based on your usage pattern.
| Parameter | Claude Opus 4.5 | GPT-5.3-Codex |
|---|---|---|
| Context Window | 200K | 400K |
| Max Output Tokens | 64,000 | 128,000 |
| Open Source | No | No |
| Created | Nov 24, 2025 | Feb 24, 2026 |
Claude Opus 4.5 scores 90/100 (rank #9) compared to GPT-5.3-Codex's 85/100 (rank #29), giving it a 5-point advantage. Claude Opus 4.5 is the stronger overall choice, though GPT-5.3-Codex may excel in specific areas like cost efficiency.
Claude Opus 4.5 is ranked #9 and GPT-5.3-Codex is ranked #29 out of 290+ AI models. Rankings use a composite score combining benchmark performance (25%), pricing (25%), context window (15%), recency (15%), output capacity (10%), and versatility (10%). Scores update hourly.
GPT-5.3-Codex is cheaper at $14.00/M output tokens vs Claude Opus 4.5's $25.00/M output tokens - 1.8x more expensive. Input token pricing: Claude Opus 4.5 at $5.00/M vs GPT-5.3-Codex at $1.75/M.
GPT-5.3-Codex has a larger context window of 400,000 tokens compared to Claude Opus 4.5's 200,000 tokens. A larger context window means the model can process longer documents and conversations.