Agentic
Directional only- GPT-5.6 Luna
- 84.1
- Laguna XS.2
- 35.7
- Weighted basis
- 2 vs 1 rows
- Reading
- Directional only
Model comparison
GPT-5.6 Luna vs Laguna XS.2
Updated August 10, 2026. Public scores include evidence status and uncertainty. They are not guarantees for a specific workload.
At least one model is not scored in the current public ranking lane, so the page does not name an overall quality winner.
3 results are shared. Category rows based on different benchmark sets are marked directional and do not name a winner.
Which one for your work
Recommendations appear only when a shared evidence basis or an explicit operating constraint supports the call. Secondary and unsupported use cases stay disclosed below the initial list.
Long documents
Prompts that approach the documented context limit
GPT-5.6 Luna
GPT-5.6 Luna has the larger documented context window.
Confidence: documented
Show secondary and unsupported calls
Coding work
Code generation, repair, and software-engineering tasks
Not enough matched evidence
The category averages use different weighted benchmark sets, so they are directional rather than like-for-like.
Confidence: limited
Agentic work
Tool use, computer use, and multi-step task completion
Not enough matched evidence
The category averages use different weighted benchmark sets, so they are directional rather than like-for-like.
Confidence: limited
Chat turn cost
1K fresh input + 500 output tokens
Not enough matched evidence
A complete comparable API-rate estimate is not available for both models.
Confidence: listed-rates
Cache-heavy agent loop cost
200K cached + 20K fresh input + 10K output tokens
Not enough matched evidence
A complete comparable API-rate estimate is not available for both models.
Confidence: listed-rates
Repository review cost
50K fresh input + 3K output tokens
Not enough matched evidence
A complete comparable API-rate estimate is not available for both models.
Confidence: listed-rates
What is actually comparable
Shared results can support a head-to-head reading. Results present for only one model describe coverage, not superiority.
19 GPT-5.6 Luna only
3 Shared
2 Laguna XS.2 only
- Shared results
- 3
- GPT-5.6 Luna only
- 19
- Laguna XS.2 only
- 2
- Like-for-like categories
- 0 / 8
2 categories use different evidence sets. Those rows remain visible for coverage context but do not name a winner.
Category results, on a stated basis
Each row states whether both averages use the same weighted benchmark set. Directional and not-comparable rows remain visible, but they never receive a winner in this template.
Coding
Directional only- GPT-5.6 Luna
- 62.7
- Laguna XS.2
- 60.8
- Weighted basis
- 1 vs 2 rows
- Reading
- Directional only
Reasoning
Not comparable- GPT-5.6 Luna
- 59.5
- Laguna XS.2
- Not measured
- Weighted basis
- 1 vs 0 rows
- Reading
- Not comparable
Knowledge
Not comparable- GPT-5.6 Luna
- 92.3
- Laguna XS.2
- Not measured
- Weighted basis
- 1 vs 0 rows
- Reading
- Not comparable
Math
Not comparable- GPT-5.6 Luna
- 73.6
- Laguna XS.2
- Not measured
- Weighted basis
- 2 vs 0 rows
- Reading
- Not comparable
Multilingual
Not comparable- GPT-5.6 Luna
- Not measured
- Laguna XS.2
- Not measured
- Weighted basis
- 0 vs 0 rows
- Reading
- Not comparable
Multimodal
Not comparable- GPT-5.6 Luna
- 78.4
- Laguna XS.2
- Not measured
- Weighted basis
- 1 vs 0 rows
- Reading
- Not comparable
Instruction following
Not comparable- GPT-5.6 Luna
- Not measured
- Laguna XS.2
- Not measured
- Weighted basis
- 0 vs 0 rows
- Reading
- Not comparable
| Category | GPT-5.6 Luna | Laguna XS.2 | Weighted basis | Reading |
|---|---|---|---|---|
| Agentic | 84.1 | 35.7 | Directional only2 vs 1 rows | Directional only |
| Coding | 62.7 | 60.8 | Directional only1 vs 2 rows | Directional only |
| Reasoning | 59.5 | Not measured | Not comparable1 vs 0 rows | Not comparable |
| Knowledge | 92.3 | Not measured | Not comparable1 vs 0 rows | Not comparable |
| Math | 73.6 | Not measured | Not comparable2 vs 0 rows | Not comparable |
| Multilingual | Not measured | Not measured | Not comparable0 vs 0 rows | Not comparable |
| Multimodal | 78.4 | Not measured | Not comparable1 vs 0 rows | Not comparable |
| Instruction following | Not measured | Not measured | Not comparable0 vs 0 rows | Not comparable |
Shape of the matched evidence
Only shared public evidence is shown. Sparse evidence stays a ruled list rather than being closed into a radar shape.
Too few matched category axes support a radar. The ruled list below shows only shared benchmark results; positions use each benchmark’s normalized display scale when available.
Terminal-Bench 2.0
Agentic
SWE-bench Pro
Coding
What each workload costs
Three fixed token mixes turn per-token rates into comparable decisions. Each scenario states context fit and whether cached input had to fall back to the published list-input rate.
Chat turn
1K fresh input + 500 output tokens
- GPT-5.6 Luna
- $0.0008
- Fits in one request
- Laguna XS.2
- Self-hosted; infrastructure cost varies
- Fits in one request
Laguna XS.2 has no comparable published API token rate.
Repository review
50K fresh input + 3K output tokens
- GPT-5.6 Luna
- $0.0136
- Fits in one request
- Laguna XS.2
- Self-hosted; infrastructure cost varies
- Fits in one request
Laguna XS.2 has no comparable published API token rate.
Cache-heavy agent loop
200K cached + 20K fresh input + 10K output tokens
- GPT-5.6 Luna
- $0.02
- Fits in one request
- Laguna XS.2
- Self-hosted; infrastructure cost varies
- Fits in one request
- Cached-input rate unavailable
Laguna XS.2 has no comparable published API token rate.
Specification differences
Sourced differences are shown directly. Missing facts stay explicit instead of being inferred from a model name or family.
SpecificationGPT-5.6 LunaLaguna XS.2
Context window
Maximum documented context; output-token limits may be lower.
GPT-5.6 Luna
1.05M
OpenAI model catalogLaguna XS.2
256K
API model ID
GPT-5.6 Luna
gpt-5.6-luna
OpenAI model catalogLaguna XS.2
Not sourced
Cached-input rate
A missing cached-input rate falls back to the listed input rate only in the stated workload estimate.
GPT-5.6 Luna
$0.02 per 1M cached input tokens
OpenAI pricingLaguna XS.2
No comparable hosted API rate
Documented inputs
GPT-5.6 Luna
text, image
OpenAI model catalogLaguna XS.2
Not sourced
Documented outputs
GPT-5.6 Luna
Laguna XS.2
Not sourced
Provider availability
GPT-5.6 Luna
Generally Available · OpenAI Responses API
OpenAI model catalogLaguna XS.2
Not sourced
Reasoning profile
GPT-5.6 Luna
Reasoning
Laguna XS.2
Reasoning
Weight access
GPT-5.6 Luna
Proprietary
Laguna XS.2
Open Weight
License
GPT-5.6 Luna
Proprietary
Laguna XS.2
Open Weight
Release date
GPT-5.6 Luna
2026-07-09
Laguna XS.2
2026-04-28
If you already use one of these models
- Deployment change
- The models list different providers, so authentication, endpoint behavior, limits, and feature support may change.
- Quality signal
- At least one model is not scored in the current public ranking lane, so the page does not name an overall quality winner.
- Workload cost
- A complete comparable API-rate estimate is not available for both models.
- Context tradeoff
- GPT-5.6 Luna has the larger documented window (1.05M).
Run the same representative tasks against both endpoints before changing production traffic.
Benchmark evidence
The full public result ledger is available for audit without forcing a wide desktop table onto a phone.
Browse raw public benchmark evidence24 rows
Agentic
Terminal-Bench 2.0
GPT-5.6 Luna84.7%SourceLaguna XS.235.7%SourceGPT-5.6 Luna leads this result
BrowseComp
GPT-5.6 Luna83.3%SourceLaguna XS.2—Not directly comparable
OSWorld 2.0
GPT-5.6 Luna45.6%SourceLaguna XS.2—Not directly comparable
CyberGym
GPT-5.6 Luna77.9%SourceLaguna XS.2—Not directly comparable
ExploitGym
GPT-5.6 Luna12.4%SourceLaguna XS.2—Not directly comparable
Toolathlon
GPT-5.6 Luna53.4%SourceLaguna XS.2—Not directly comparable
Coding
SWE-bench Pro
GPT-5.6 Luna62.7%SourceLaguna XS.246.3%SourceGPT-5.6 Luna leads this result
Terminal-Bench 2.0
GPT-5.6 Luna84.7%SourceLaguna XS.235.7%SourceGPT-5.6 Luna leads this result
deepSwe
GPT-5.6 Luna67.2%SourceLaguna XS.2—Not directly comparable
FrontierCode 1.1 Extended
GPT-5.6 Luna55.1%SourceLaguna XS.2—Not directly comparable
cursorBench32
GPT-5.6 Luna61.1%SourceLaguna XS.2—Not directly comparable
SWE-bench Verified
GPT-5.6 Luna—Laguna XS.269.9%SourceNot directly comparable
SWE Multilingual
GPT-5.6 Luna—Laguna XS.257.7%SourceNot directly comparable
Reasoning
Knowledge
Math
Multimodal
Frequently asked questions
Which is better, GPT-5.6 Luna or Laguna XS.2?
At least one model is not scored in the current public ranking lane, so the page does not name an overall quality winner. The page therefore keeps the decision tied to the specific documented workload.
Which is better for coding, GPT-5.6 Luna or Laguna XS.2?
The current coding averages use different weighted benchmark sets, so BenchLM does not name a winner from them. Read the shared benchmark rows directly and test the models on the same task set.
Which is better for agentic tasks, GPT-5.6 Luna or Laguna XS.2?
The current agentic tasks averages use different weighted benchmark sets, so BenchLM does not name a winner from them. Read the shared benchmark rows directly and test the models on the same task set.
Which costs less, GPT-5.6 Luna or Laguna XS.2?
Both models do not have comparable published API token rates, so this page does not name a universal price winner.
Which has the larger context window, GPT-5.6 Luna or Laguna XS.2?
GPT-5.6 Luna has the larger documented context window: 1.05M, compared with 256K.
Related comparisons
Last updated August 10, 2026
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