# GPT-5.3 Codex vs GPT-6.1 Terra

> Side-by-side benchmark comparison for GPT-5.3 Codex and GPT-6.1 Terra across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-3-codex-vs-gpt-6-1-terra
- Last updated: October 26, 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 GPT-5.3 Codex and GPT-6.1 Terra.

## Summary

- GPT-5.3 Codex and GPT-6.1 Terra 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 | GPT-5.3 Codex | GPT-6.1 Terra |
|----------|----------|----------|
| Creator | OpenAI | OpenAI |
| Type | Proprietary | Proprietary |
| Reasoning | Reasoning | Reasoning |
| Context | 400K | 1.05M |
| Independent public score (not head-to-head) | 60.67 | 75.87 |
| Benchmarks Covered | 11 | 10 |
| Pricing (input/output) | $1.75 / $14.00 | $1.00 / $5.00 |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 55.8 (Estimated · #44/133)
- GPT-6.1 Terra public-lane score: 72.4 (Estimated · #8/133)

| Benchmark | GPT-5.3 Codex | GPT-6.1 Terra | Winner |
|-----------|-----------|-----------|--------|
| Terminal-Bench 2.0 | 77.3% | Coming soon | Coming soon |
| OSWorld-Verified | 64.7% | Coming soon | Coming soon |
| Gert Labs | 57.47% | Coming soon | Coming soon |
| JobBench | 33.7% | Coming soon | Coming soon |
| Terminal-Bench 4.0 | Coming soon | 50.30% | Coming soon |
| Terminal-Bench-Science 0.1 | Coming soon | 58.3% | Coming soon |
| Agents' Last Exam | Coming soon | 60.0% | Coming soon |
| OSWorld 2.1 Offline | Coming soon | 74.2% | Coming soon |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 53.7 (Supported · #36/154)
- GPT-6.1 Terra public-lane score: Coming soon

| Benchmark | GPT-5.3 Codex | GPT-6.1 Terra | Winner |
|-----------|-----------|-----------|--------|
| SWE-bench Verified | 85% | Coming soon | Coming soon |
| SWE-bench Pro | 56.8% | Coming soon | Coming soon |
| SWE-Rebench | 58.2% | Coming soon | Coming soon |
| Terminal-Bench 2.0 | 77.3% | Coming soon | Coming soon |
| Vibe Code Bench | 61.77% | Coming soon | Coming soon |
| LiveCodeBench (Vals) | 87.3% | Coming soon | Coming soon |
| SWE-bench (Vals) | 78.0% | Coming soon | Coming soon |

### Reasoning

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 82.2 (Unranked · 2 rankable rows)
- GPT-6.1 Terra public-lane score: 81.8 (Unranked · 2 rankable rows)

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 81 (Unranked · 1 rankable row)
- GPT-6.1 Terra public-lane score: 91.6 (#4/58)

| Benchmark | GPT-5.3 Codex | GPT-6.1 Terra | Winner |
|-----------|-----------|-----------|--------|
| MMMU-Pro | Coming soon | 85.5% | Coming soon |

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 64.8 (Estimated · #34/188)
- GPT-6.1 Terra public-lane score: 74.9 (Supported · #12/188)

| Benchmark | GPT-5.3 Codex | GPT-6.1 Terra | Winner |
|-----------|-----------|-----------|--------|
| HealthBench (raw) | Coming soon | 51.1% | Coming soon |
| HealthBench (length-adjusted) | Coming soon | 55.1% | Coming soon |
| HealthBench Professional | Coming soon | 62.7% | Coming soon |
| HealthBench Professional (raw) | Coming soon | 64.2% | Coming soon |
| HealthBench Hard | Coming soon | 31.4% | Coming soon |

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 92.6 (#19/155)
- GPT-6.1 Terra public-lane score: Coming soon

## FAQ

### Can I compare GPT-5.3 Codex and GPT-6.1 Terra 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

- [GPT-5.3 Codex vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-vs-gpt-5-3-codex-spark)
- [GPT-6.1 Terra vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-spark-vs-gpt-6-1-terra)
- [GPT-5.3 Codex vs GPT-6 Astra](/compare/gpt-5-3-codex-vs-gpt-6-astra)
- [GPT-6.1 Terra vs GPT-6 Astra](/compare/gpt-6-1-terra-vs-gpt-6-astra)

## Explore More

- [GPT-5.3 Codex profile](/models/gpt-5-3-codex)
- [GPT-6.1 Terra profile](/models/gpt-6-1-terra)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)