OpenAI: GPT-5.3-Codex
Released Feb 24, 2026Ranked in:WebDev
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GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...
Best overall rank
#31
Across all subsets · overall
Total arena votes
12,006
Across 5 (subset, category) entries
Providers on OR
2
Azure + others
First seen
2026-05-08
26 days tracked
Trend
Pricing
Per token
- Input (per 1M)
- $1.75
- Output (per 1M)
- $14.00
- Cache Read (per 1M)
- $0.175
Per unit
- Web search
- $0.010/call
Capabilities
Modality
text+image+file->textContext
400K tokens
Tokenizer
GPT
Max output
128K tokens
Moderation
Moderated
Supported parameters
include_reasoning
max_completion_tokens
max_tokens
reasoning
response_format
seed
structured_outputs
tool_choice
tools
Providers
| Provider | Region / Tag | Context | Input/M | Output/M | Uptime 1d | Latency | Quant | Cache |
|---|---|---|---|---|---|---|---|---|
| Azure | azure | 400K | $1.75 | $14.00 | 99.66% | - | - | - |
| OpenAI | openai | 400K | $1.75 | $14.00 | 98.67% | - | - | - |
Per-category ranks
WebDev
| Rank | Category | Variant | Trend | Elo | Votes |
|---|---|---|---|---|---|
| #14 | Image To Webdev | harness: codex-harness | 1441 | 2,506 | |
| #30 | Webdev-html | harness: codex-harness | 1427 | 394 | |
| #30 | Webdev-react | harness: codex-harness | 1396 | 2,597 | |
| #31 | Overall | harness: codex-harness | 1407 | 2,963 | |
| #48 | Webdev | harness: codex-harness | 1373 | 3,546 |