Model comparison
GPT-5.3-Codex-Spark vs Nova Pro
Head-to-head evidence from 0 shared benchmark results across 0 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.
Public leaderboard positions: GPT-5.3-Codex-Spark #79 (Estimated); Nova Pro #206 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.
Evidence parity. GPT-5.3-Codex-Spark and Nova Pro share 0 comparable benchmark results. 0 of 8 categories are comparable. 0 results are unique to GPT-5.3-Codex-Spark; 12 to Nova Pro.
Updated July 28, 2026- Shared results
- 0
- GPT-5.3-Codex-Spark only
- 0
- Nova Pro only
- 12
- Comparable categories
- 0 / 8
Benchmark data for GPT-5.3-Codex-Spark and Nova Pro is coming soon on BenchLM.
Confidence note. This is a partial-evidence comparison with 0 shared benchmark results across 0 evidence categories; 0 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.
Why this result
BenchLM does not have sourced benchmark coverage for GPT-5.3-Codex-Spark yet. This comparison is currently limited to metadata such as context window, reasoning mode, and pricing where available.
GPT-5.3-Codex-Spark has the larger context window at 256K, compared with 128K for Nova Pro.
Operational comparison
Runtime and commercial metrics are compared only when both models have a complete sourced value.
| Metric | GPT-5.3-Codex-Spark | Nova Pro | Comparison |
|---|---|---|---|
| Input / output priceUSD per 1M tokens | GPT-5.3-Codex-SparkNot available | Nova ProNot available | A complete price comparison is not available. |
| Generation speedtokens per second | GPT-5.3-Codex-SparkNot available | Nova Pro141 tok/s | A complete speed comparison is not available. |
| First-answer latencyseconds to first token | GPT-5.3-Codex-SparkNot available | Nova Pro0.81 s | A complete latency comparison is not available. |
| Context windowmaximum listed tokens | GPT-5.3-Codex-Spark256K | Nova Pro128K | GPT-5.3-Codex-Spark lists the larger context window. |
Benchmark Deep Dive
Agentic1 benchmarks
| Benchmark | GPT-5.3-Codex-Spark | Nova Pro | Result |
|---|---|---|---|
| τ²-bench resultsSource | — | 14% | Not comparable |
Coding1 benchmarks
| Benchmark | GPT-5.3-Codex-Spark | Nova Pro | Result |
|---|---|---|---|
| AA-SciCodeSource | — | 20.8% | Not comparable |
Reasoning2 benchmarks
Knowledge6 benchmarks
| Benchmark | GPT-5.3-Codex-Spark | Nova Pro | Result |
|---|---|---|---|
| Artificial Analysis Intelligence IndexSource | — | 7.7% | Not comparable |
| AA-GPQA DiamondSource | — | 49.9% | Not comparable |
| AA-HLESource | — | 3.4% | Not comparable |
| AA-Omniscience IndexSource | — | -47.6% | Not comparable |
| AA-Omniscience AccuracySource | — | 17.0% | Not comparable |
| AA-Omniscience Hallucination RateSource | — | 77.9% | Not comparable |
Multimodal1 benchmarks
| Benchmark | GPT-5.3-Codex-Spark | Nova Pro | Result |
|---|---|---|---|
| AA-MMMU-ProSource | — | 44.3% | Not comparable |
Inst. Following1 benchmarks
| Benchmark | GPT-5.3-Codex-Spark | Nova Pro | Result |
|---|---|---|---|
| AA-IFBenchSource | — | 38.1% | Not comparable |
Frequently Asked Questions (3)
Can I compare GPT-5.3-Codex-Spark and Nova Pro on BenchLM yet?
Not fully yet. BenchLM is tracking both models, but the sourced benchmark breakdown for this comparison is still coming soon.
Why does this comparison show “coming soon”?
BenchLM only shows category winners and benchmark-level calls when we have sourced results that can be compared fairly. For these models, the public benchmark coverage is not complete enough yet.
What data is available for GPT-5.3-Codex-Spark and Nova Pro today?
GPT-5.3-Codex-Spark: Pricing unavailable Nova Pro: Pricing unavailable Both model pages still include creator, context window, reasoning mode, and other metadata while benchmark coverage fills in.
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