AI Models · Paid vs Paid

Claude Opus 4.8 Paid vs GPT-5.6 Luna Paid

Claude Opus 4.8 vs GPT-5.6 Luna compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.

Claude Opus 4.8 — 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 $25/M). It also gives you the larger 1.1M context window.

Claude Opus 4.8 vs GPT-5.6 Luna specs

SpecClaude Opus 4.8GPT-5.6 Luna
MakerAnthropicOpenAI
TypeProprietaryProprietary
Context window1M tokens1.1M tokens
Input price$5/M$1/M
Output price$25/M$6/M
Vision / multimodalYesYes
Tool / function callingYesYes
Self-hostableNo (API only)No (API only)
LicenseProprietaryProprietary

Feature comparison

CapabilityClaude Opus 4.8GPT-5.6 Luna
Open weights (downloadable)✗✗
Self-hostable✗✗
Runs fully offline✗✗
Vision / multimodal✓✓
Tool / function calling✓✓
1M+ context window✓✓

Benchmarks: Claude Opus 4.8 vs GPT-5.6 Luna

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

GPT-5.6 Luna delivers 4.1× more intelligence per dollar.
Claude Opus 4.8
GPT-5.6 Luna
Intelligence index
55.7
51.2
Coding index
74.3
71.4
GPQA
92%
91.1%
Humanity's Last Exam
45.7%
37.2%
Long Context Reasoning
67.7%
74%
SciCode
53.5%
52.5%
IFBench
62.2%
–
τ²-Bench
94.4%
–
τ-Bench Banking
27.6%
27.2%
Terminal-Bench
84.6%
80.9%
Terminal-Bench Hard
58.3%
–
Speed
62.5 tok/s
212.1 tok/s
Latency
28.57s
63.49s
Intelligence per $
5.6
22.8

Benchmark data by Artificial Analysis.

How Claude Opus 4.8 and GPT-5.6 Luna score

🤝 Neck and neck on these criteria (3.1 vs 3.3 / 5).
CriterionClaude Opus 4.8GPT-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 Opus 4.8 Paid

Anthropic · Proprietary

Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family. It supports text, image, and file inputs with text output, with reasoning support and a 1M-token...

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 Opus 4.7Claude Opus 4.6

Frequently asked questions

Claude Opus 4.8 vs GPT-5.6 Luna — which is cheaper?

GPT-5.6 Luna is cheaper on output ($6/M vs $25/M).

Which has the larger context window?

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

Claude Opus 4.8 vs GPT-5.6 Luna — which should I pick in 2026?

Choose GPT-5.6 Luna for the lower output price ($6/M vs $25/M). It also gives you the larger 1.1M context window.

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