AI Models · Paid vs Paid

Claude Sonnet 4.6 Paid vs GPT-5.6 Luna Paid

Claude Sonnet 4.6 vs GPT-5.6 Luna compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.

Claude Sonnet 4.6 — full profile ›  ·  GPT-5.6 Luna — full profile ›

Prices & specs refreshed from live data · OpenSourceAI.tech

Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.

Choose GPT-5.6 Luna for the lower output price ($6/M vs $15/M). It also gives you the larger 1.1M context window.

Claude Sonnet 4.6 vs GPT-5.6 Luna specs

SpecClaude Sonnet 4.6GPT-5.6 Luna
MakerAnthropicOpenAI
TypeProprietaryProprietary
Context window1M tokens1.1M tokens
Input price$3/M$1/M
Output price$15/M$6/M
Vision / multimodalYesYes
Tool / function callingYesYes
Self-hostableNo (API only)No (API only)
LicenseProprietaryProprietary

Feature comparison

CapabilityClaude Sonnet 4.6GPT-5.6 Luna
Open weights (downloadable)✗✗
Self-hostable✗✗
Runs fully offline✗✗
Vision / multimodal✓✓
Tool / function calling✓✓
1M+ context window✓✓

Benchmarks: Claude Sonnet 4.6 vs GPT-5.6 Luna

Independent benchmark scores measured by Artificial Analysis. Higher is better (except latency).

GPT-5.6 Luna delivers 2.9× more intelligence per dollar.
Claude Sonnet 4.6
GPT-5.6 Luna
Intelligence index
47.2
51.2
Coding index
63
71.4
GPQA
87.5%
91.1%
Humanity's Last Exam
30%
37.2%
Long Context Reasoning
70.7%
74%
SciCode
46.8%
52.5%
IFBench
56.6%
–
τ²-Bench
75.7%
–
τ-Bench Banking
30.5%
27.2%
Terminal-Bench
71.2%
80.9%
Terminal-Bench Hard
53%
–
Speed
69.6 tok/s
212.1 tok/s
Latency
51.32s
63.49s
Intelligence per $
7.9
22.8

Benchmark data by Artificial Analysis.

How Claude Sonnet 4.6 and GPT-5.6 Luna score

🤝 Neck and neck on these criteria (3.1 vs 3.3 / 5).
CriterionClaude Sonnet 4.6GPT-5.6 Luna
Cost-efficiency3.04.0
Context window5.05.0
Openness1.51.5
Self-hosting1.01.0
Multimodality5.05.0

Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.

What each model is

Claude Sonnet 4.6 Paid

Anthropic · Proprietary

Sonnet 4.6 is Anthropic's most capable Sonnet-class model yet, with frontier performance across coding, agents, and professional work. It excels at iterative development, complex codebase navigation, end-to-end project management with...

GPT-5.6 Luna Paid

OpenAI · Proprietary

GPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning for...

Other models in these families

These variants are tracked but not compared here — one page per family keeps the comparison readable.

Other variants tracked
Claude Sonnet 4.5Claude Sonnet 5

Frequently asked questions

Claude Sonnet 4.6 vs GPT-5.6 Luna — which is cheaper?

GPT-5.6 Luna is cheaper on output ($6/M vs $15/M).

Which has the larger context window?

GPT-5.6 Luna offers the larger context window (1.1M tokens).

Claude Sonnet 4.6 vs GPT-5.6 Luna — which should I pick in 2026?

Choose GPT-5.6 Luna for the lower output price ($6/M vs $15/M). It also gives you the larger 1.1M context window.

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