# GPT-5.3 Codex vs swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4)

> Side-by-side benchmark comparison for GPT-5.3 Codex and swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) across agentic, coding, multimodal, knowledge, reasoning, multilingual, and math tasks.

- Canonical page: https://benchlm.ai/compare/gpt-5-3-codex-vs-jevbench-swanone
- Last updated: September 30, 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 swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4).

## Summary

- GPT-5.3 Codex and swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) 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 | swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) |
|----------|----------|----------|
| Creator | OpenAI | blockbrain |
| Type | Proprietary | Open Weight |
| Reasoning | Reasoning | Non-Reasoning |
| Context | 400K | null |
| Independent public score (not head-to-head) | 62.46 | null |
| Benchmarks Covered | 10 | 2 |
| Pricing (input/output) | $1.75 / $14.00 | Pricing unavailable / Pricing unavailable |

## Category Breakdown

### Agentic

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 55.4 (Estimated · #34/119)
- swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) public-lane score: Coming soon

| Benchmark | GPT-5.3 Codex | swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) | 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 |

### Coding

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 56.1 (Supported · #29/144)
- swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) public-lane score: Coming soon

| Benchmark | GPT-5.3 Codex | swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) | 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 |
| 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: 79.6 (Unranked · 2 rankable rows)
- swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) public-lane score: Coming soon

| Benchmark | GPT-5.3 Codex | swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) | Winner |
|-----------|-----------|-----------|--------|
| JevBench 1.4 | Coming soon | 33.61 | Coming soon |
| JevBench 1.5 | Coming soon | 46.56 | Coming soon |

### Multimodal & Grounded

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 76.7 (Unranked · 1 rankable row)
- swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) public-lane score: Coming soon

### Knowledge

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 64.8 (Estimated · #26/170)
- swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) public-lane score: Coming soon

### Instruction Following

- Winner: Insufficient shared evidence
- GPT-5.3 Codex public-lane score: 91.2 (#14/124)
- swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) public-lane score: Coming soon

## FAQ

### Can I compare GPT-5.3 Codex and swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) 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)
- [swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) vs GPT-5.3-Codex-Spark](/compare/gpt-5-3-codex-spark-vs-jevbench-swanone)
- [GPT-5.3 Codex vs GPT-6 Astra](/compare/gpt-5-3-codex-vs-gpt-6-astra)
- [swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) vs GPT-6 Astra](/compare/gpt-6-astra-vs-jevbench-swanone)

## Explore More

- [GPT-5.3 Codex profile](/models/gpt-5-3-codex)
- [swanOne (blockbrain, Qwen3.8-Flash-Next NVFP4) profile](/models/jevbench-swanone)
- [Compare Pricing](/llm-pricing)
- [Alternative Finder](/tools/alternative-finder)
- [LLM Selector](/tools/llm-selector)
- [Overall Rankings](/best/overall)