Model comparison

GPT-5.6 Sol vs Laguna XS.2

Data verified July 23, 2026

Head-to-head evidence from 3 shared benchmark results across 2 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

GPT-5.6 Sol

OpenAI

81.96/100

No comparison

Laguna XS.2

Poolside

N/A

2 category wins0 category wins

Public leaderboard positions: GPT-5.6 Sol #3 (Supported); Laguna XS.2 unranked (Not scored). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. GPT-5.6 Sol and Laguna XS.2 share 3 comparable benchmark results. 2 of 8 categories are comparable. 43 results are unique to GPT-5.6 Sol; 2 to Laguna XS.2.

Updated July 23, 2026

Shared results: 3
GPT-5.6 Sol only: 43
Laguna XS.2 only: 2
Comparable categories: 2 / 8

Treat this as a split decision. GPT-5.6 Sol makes more sense if agentic is the priority or you need the larger 1M context window; Laguna XS.2 is the better fit if you want the cheaper token bill.

Confidence note. This is a partial-evidence comparison with 3 shared benchmark results across 2 evidence categories; 2 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

GPT-5.6 Sol and Laguna XS.2 finish on the same BenchAlign overall score, so this is less about a single winner and more about where the edge shows up. The BenchAlign headline says tie; the benchmark table is where the real choice happens.

GPT-5.6 Sol is also the more expensive model on tokens at $5.00 input / $30.00 output per 1M tokens, versus $0.00 input / $0.00 output per 1M tokens for Laguna XS.2. That is roughly Infinityx on output cost alone. GPT-5.6 Sol gives you the larger context window at 1M, compared with 256K for Laguna XS.2.

Category breakdown

Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.

Category scores and score margins for GPT-5.6 Sol and Laguna XS.2
Category	GPT-5.6 Sol	Δ	Laguna XS.2
Agentic	GPT-5.6 Sol92.0	Margin← 56.3	Laguna XS.235.7
Coding	GPT-5.6 Sol64.6	Margin← 3.8	Laguna XS.260.8
Knowledge	GPT-5.6 Sol94.6	MarginNo overlap	Laguna XS.2Not measured
Math	GPT-5.6 Sol87.5	MarginNo overlap	Laguna XS.2Not measured
Multimodal	GPT-5.6 Sol83.0	MarginNo overlap	Laguna XS.2Not measured

Decisive benchmark drivers

The largest measured benchmark gaps in this matchup, with exact reported values.

A · GPT-5.6 SolB · Laguna XS.2

Terminal-Bench 2.0
Agentic
Source ↗
A 91.9%B 35.7%
Winner: GPT-5.6 SolΔ 56.2
Terminal-Bench 2.0: GPT-5.6 Sol scored 91.9%; Laguna XS.2 scored 35.7%. GPT-5.6 Sol wins this benchmark.
SWE-bench Pro
Coding
Source ↗
A 64.6%B 46.3%
Winner: GPT-5.6 SolΔ 18.3
SWE-bench Pro: GPT-5.6 Sol scored 64.6%; Laguna XS.2 scored 46.3%. GPT-5.6 Sol wins this benchmark.

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

Metric	GPT-5.6 Sol	Laguna XS.2	Comparison
Input / output priceUSD per 1M tokens	GPT-5.6 Sol$5 input / $30 output	Laguna XS.2$0 input / $0 output	Laguna XS.2 has the lower combined listed price.
Generation speedtokens per second	GPT-5.6 SolNot available	Laguna XS.2Not available	A complete speed comparison is not available.
First-answer latencyseconds to first token	GPT-5.6 SolNot available	Laguna XS.2Not available	A complete latency comparison is not available.
Context windowmaximum listed tokens	GPT-5.6 Sol1M	Laguna XS.2256K	GPT-5.6 Sol lists the larger context window.

Benchmark Deep Dive

AgenticGPT-5.6 Sol wins

17 benchmarks

Benchmark	GPT-5.6 Sol	Laguna XS.2	Result
Terminal-Bench 2.0Source	91.9%	35.7%	GPT-5.6 Sol leads
BrowseCompSource	92.2%	—	Not comparable
OSWorld 2.0Source	62.6%	—	Not comparable
CyberGymSource	84.5%	—	Not comparable
ExploitGymSource	33.7%	—	Not comparable
ToolathlonSource	58%	—	Not comparable
AA Agentic IndexSource	54.0%	—	Not comparable
τ²-bench resultsSource	85.1%	—	Not comparable
GDPval-AASource	61.8%	—	Not comparable
GDPval-AASource	1736	—	Not comparable
AA BriefcaseSource	1501	—	Not comparable
AA ITBenchSource	56.2%	—	Not comparable
AA Tau3 BankingSource	33.0%	—	Not comparable
AA AutomationBenchSource	51.2%	—	Not comparable
AA Harvey LABSource	87.2%	—	Not comparable
terminalBenchHardSource	65.9%	—	Not comparable
aaTerminalBench21Source	88%	—	Not comparable

CodingGPT-5.6 Sol wins

10 benchmarks

Benchmark	GPT-5.6 Sol	Laguna XS.2	Result
SWE-bench ProSource	64.6%	46.3%	GPT-5.6 Sol leads
Terminal-Bench 2.0Source	91.9%	35.7%	GPT-5.6 Sol leads
deepSweSource	72.7%	—	Not comparable
FrontierCode 1.1 ExtendedSource	60.6%	—	Not comparable
cursorBench32Source	67.2%	—	Not comparable
VulcanBench v3Source	87.0%	—	Not comparable
AA Coding IndexSource	77.4%	—	Not comparable
AA-SciCodeSource	56.1%	—	Not comparable
SWE-bench VerifiedSource	—	69.9%	Not comparable
SWE MultilingualSource	—	57.7%	Not comparable

Reasoning

4 benchmarks

Benchmark	GPT-5.6 Sol	Laguna XS.2	Result
ARC-AGI-3Source	7.8%	—	Not comparable
GeneBench-ProSource	28.7%	—	Not comparable
AA-LCRSource	73.7%	—	Not comparable
CritPtSource	32.3%	—	Not comparable

Knowledge

10 benchmarks

Benchmark	GPT-5.6 Sol	Laguna XS.2	Result
GPQASource	94.6%	—	Not comparable
GPQA-DSource	94.6%	—	Not comparable
HealthBench ProfessionalSource	60.5%	—	Not comparable
HealthBench HardSource	33.1%	—	Not comparable
Artificial Analysis Intelligence IndexSource	58.9%	—	Not comparable
AA-GPQA DiamondSource	94.1%	—	Not comparable
AA-HLESource	47.2%	—	Not comparable
AA-Omniscience IndexSource	21.7%	—	Not comparable
AA-Omniscience AccuracySource	58.5%	—	Not comparable
AA-Omniscience Hallucination RateSource	88.8%	—	Not comparable

Math

3 benchmarks

Benchmark	GPT-5.6 Sol	Laguna XS.2	Result
FrontierMath (legacy)Source	89%	—	Not comparable
FrontierMath v2 (Tiers 1-3)Source	89.000%	—	Not comparable
FrontierMath v2 (Tier 4)Source	83.000%	—	Not comparable

Multimodal

3 benchmarks

Benchmark	GPT-5.6 Sol	Laguna XS.2	Result
MMMU-ProSource	83%	—	Not comparable
MMMU-Pro w/ PythonSource	84.6%	—	Not comparable
AA-MMMU-ProSource	83.4%	—	Not comparable

Inst. Following

1 benchmarks

Benchmark	GPT-5.6 Sol	Laguna XS.2	Result
AA-IFBenchSource	72.7%	—	Not comparable

Frequently Asked Questions (3)

Which is better, GPT-5.6 Sol or Laguna XS.2?

GPT-5.6 Sol and Laguna XS.2 are tied on the BenchAlign overall score, so the right pick depends on which category matters most for your use case.

Which is better for coding, GPT-5.6 Sol or Laguna XS.2?

GPT-5.6 Sol has the edge for coding in this comparison, averaging 64.6 versus 60.8. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.

Which is better for agentic tasks, GPT-5.6 Sol or Laguna XS.2?

GPT-5.6 Sol has the edge for agentic tasks in this comparison, averaging 92 versus 35.7. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.

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