# d1-ultra vs GPT-5.1-Codex

> Side-by-side benchmark comparison for d1-ultra and GPT-5.1-Codex across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/d1-ultra-vs-gpt-5-1-codex
- Last updated: October 15, 2026

- Shared sourced benchmarks: 0
- HTML indexing: indexable
- Ranking lane: BenchAlign v5.8

## Quick Verdict

No benchmark verdict yet: there is no shared sourced benchmark row for d1-ultra and GPT-5.1-Codex.

## Summary

- d1-ultra and GPT-5.1-Codex do not currently share a sourced benchmark row. The mirror therefore compares metadata, pricing, context windows, and each model's separately reported coverage without naming a benchmark winner.

## Model Snapshot

| Property | d1-ultra | GPT-5.1-Codex |
|----------|----------|----------|
| Creator | Liquid AI | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Non-Reasoning | Reasoning |
| Context | null | 400K |
| Independent public score (not head-to-head) | null | 50.37 |
| Benchmarks Covered | 0 | 4 |
| Pricing (input/output) | $0.042 / $0.00 | $1.25 / $10.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- d1-ultra public-lane score: Coming soon
- GPT-5.1-Codex public-lane score: Coming soon

| Benchmark | d1-ultra | GPT-5.1-Codex | Winner |
|-----------|-----------|-----------|--------|
| Gert Labs | Coming soon | 49.68% | Coming soon |
| JobBench | Coming soon | 26.2% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- d1-ultra public-lane score: Coming soon
- GPT-5.1-Codex public-lane score: 33.6 (Estimated · #83/150)

| Benchmark | d1-ultra | GPT-5.1-Codex | Winner |
|-----------|-----------|-----------|--------|
| Vibe Code Bench | Coming soon | 13.12% | Coming soon |
| LiveCodeBench (Vals) | Coming soon | 85.6% | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- d1-ultra public-lane score: Coming soon
- GPT-5.1-Codex public-lane score: 73.5 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- d1-ultra public-lane score: Coming soon
- GPT-5.1-Codex public-lane score: 71.3 (Unranked · 1 rankable row)

### Knowledge

- Winner: Insufficient shared evidence
- d1-ultra public-lane score: Coming soon
- GPT-5.1-Codex public-lane score: 52 (Estimated · #72/184)

### Instruction Following

- Winner: Insufficient shared evidence
- d1-ultra public-lane score: Coming soon
- GPT-5.1-Codex public-lane score: 85.6 (#47/146)

## FAQ

### Can I compare d1-ultra and GPT-5.1-Codex on BenchLM yet?

Not fully yet. BenchLM is tracking both models, but sourced benchmark coverage is still incomplete for a fair score-level comparison.

### Why does this page show "coming soon" values?

BenchLM only calls winners when public benchmark coverage is available on both sides of the comparison.

## Related Comparisons

- [d1-ultra vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-d1-ultra)
- [GPT-5.1-Codex vs Claude Opus 5.5](/compare/claude-opus-5-5-vs-gpt-5-1-codex)
- [d1-ultra vs GPT-6.1 Sol](/compare/d1-ultra-vs-gpt-6-1-sol)
- [GPT-5.1-Codex vs GPT-6.1 Sol](/compare/gpt-5-1-codex-vs-gpt-6-1-sol)

## Explore More

- [d1-ultra profile](/models/d1-ultra)
- [GPT-5.1-Codex profile](/models/gpt-5-1-codex)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)