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Claude Haiku 5.5 vs GPT-6 Luna

Side-by-side pricing per provider, context window, benchmark scores and speed, all on one OpenAI-compatible API.

Estimate monthly cost for these models
Metric
Claude Haiku 5.5Anthropicanthropic/claude-haiku-5.5
GPT-6 LunaOpenAIopenai/gpt-6-luna
Creator
Anthropic
OpenAI
Released
Oct 7, 2026
Sep 22, 2026
Context window
1M (best)
400K
Max output
128K
128K
Input / 1MLowest provider price
$0.10
$0.10
Output / 1MLowest provider price
$0.50
$0.50
Providers
3 (best)
1
IntelligenceArtificial Analysis index
34.3 (best)
27.8
Accepts
Image, Text
Files, Image, Text
Produces
Text
Text
Tool calling
Yes
Yes
Structured output
Yes
Yes
Reasoning
Yes
Yes

Claude Haiku 5.5 vs GPT-6 Luna: summary

Claude Haiku 5.5 and GPT-6 Luna are both available through FastRouter's OpenAI-compatible API, so switching between them is a change of model id, not a new integration.

Claude Haiku 5.5, from Anthropic, has a 1,000,000-token context window, costs from $0.10/1M input and $0.50/1M output tokens across 3 providers and scores 34.3 on the Artificial Analysis Intelligence Index.

GPT-6 Luna, from OpenAI, has a 400,000-token context window, costs $0.10/1M input and $0.50/1M output tokens and scores 27.8 on the Artificial Analysis Intelligence Index.

Claude Haiku 5.5 has the largest context window and Claude Haiku 5.5 scores highest for intelligence.

Switch with one line

client = OpenAI(base_url="https://api.fastrouter.ai/api/v1", api_key="<FASTROUTER_API_KEY>") client.chat.completions.create(model="anthropic/claude-haiku-5.5", messages=[...]) # or client.chat.completions.create(model="openai/gpt-6-luna", messages=[...])
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Benchmark scores sourced from ArtificialAnalysis