OpenAI: GPT-5.1-Codex
Released Nov 13, 2025Ranked in:WebDev
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GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Best overall rank
#60
Across all subsets · overall
Total arena votes
18,630
Across 3 (subset, category) entries
Providers on OR
2
Azure + others
First seen
2026-05-08
26 days tracked
Trend
Pricing
Per token
- Input (per 1M)
- $1.25
- Output (per 1M)
- $10.00
- Cache Read (per 1M)
- $0.130
Per unit
- Web search
- $0.010/call
Capabilities
Modality
text+image->textContext
400K tokens
Tokenizer
GPT
Max output
128K tokens
Moderation
Unmoderated
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 | $1.25 | $10.00 | 100.00% | - | - | ✓ |
| OpenAI | openai | 400K | $1.25 | $10.00 | 81.14% | - | - | ✓ |
Per-category ranks
WebDev
| Rank | Category | Variant | Trend | Elo | Votes |
|---|---|---|---|---|---|
| #58 | Webdev-html | - | 1336 | 6,198 | |
| #60 | Overall | - | 1329 | 6,216 | |
| #60 | Webdev | - | 1329 | 6,216 |