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AnthropicOpenAILLM matchup

Claude Sonnet 4.5vs.GPT-6 Luna

Which one is better?

GPT-6 Luna performs better than Claude Sonnet 4.5 and is cheaper: Claude Sonnet 4.5 costs 30 times as much.

GPT-6 Luna ahead
IntelligenceOverall index, 100 points = average
65.4

Claude Sonnet 4.5

Rank 71

96.3

GPT-6 Luna

Rank 35

GPT-6 Luna faster
SpeedTokens per second
59

Claude Sonnet 4.5

101

GPT-6 Luna

GPT-6 Luna cheaper
Price$ per 1M tokens
$6

Claude Sonnet 4.5

$0.20

GPT-6 Luna

GPT-6 Luna more popular
Popularity0 to 100
50

Claude Sonnet 4.5

Rank 102 of 785

60

GPT-6 Luna

Rank 30 of 785

Above 272,000 tokens of context, GPT-6 Luna costs more: $0.20 input and $0.75 output per 1M tokens.

Choose Claude Sonnet 4.5 for

No clear advantage

Choose GPT-6 Luna for

CodingAgentsFinanceLegalProductivityHealth

Where is the difference?

GPT-6 Luna is ahead in 5 of 10 areas, Sonnet 4.5 in none.

too little data: 5GPT-6 Luna ahead: 5

Areas in the overall index
CodingGPT-6 Luna +3661.7 to 97.5
AgentsGPT-6 Luna +3267.9 to 99.5
Reasoningonly GPT-6 Luna has a score
Mathematicsonly GPT-6 Luna has a score
Knowledgeonly GPT-6 Luna has a score
Generalonly GPT-6 Luna has a score
Multimodalonly GPT-6 Luna has a score
Specialist fields
FinanceGPT-6 Luna +3068.3 to 98.3
LegalGPT-6 Luna +2664.7 to 90.7
HealthGPT-6 Luna +2174.3 to 95.2

Bar length shows the gap in index points (full width 15 points, one standard deviation of the reference group). Solid means clearly ahead, hatched not certain yet, a thin grey bar level.

Show 4 more areas that do not count toward the overall index
ProductivityGPT-6 Luna +2367.0 to 90.5
Cybersecurityonly GPT-6 Luna has a score
Searchonly GPT-6 Luna has a score
Educationonly GPT-6 Luna has a score

Bar length shows the gap in index points (full width 15 points, one standard deviation of the reference group). Solid means clearly ahead, hatched not certain yet, a thin grey bar level.

Which model for which task?

Everyday tasks, translated from the area values above. Each row names the values it rests on.

Writing and debugging codeGPT-6 LunaCoding 61.7 to 97.5
Maths and data analysisopenMathematics without a score for Sonnet 4.5, Reasoning without a score for Sonnet 4.5
Facts and researchopenKnowledge without a score for Sonnet 4.5, Search without a score for Sonnet 4.5
Agents and workflowsGPT-6 LunaAgents 67.9 to 99.5
Fast chat repliesGPT-6 Luna59 to 101 tokens per second
Security analysisopenCybersecurity without a score for Sonnet 4.5
Many requests on a small budgetGPT-6 Luna$6 to $0.20 per 1M tokens
Finance, legal and medical textsGPT-6 LunaFinance 68.3 to 98.3, Legal 64.7 to 90.7, Health 74.3 to 95.2
Images, screenshots and PDFsopenMultimodal without a score for Sonnet 4.5

See for yourself: same task, one attempt

The same prompt for both models. We show the latest attempt without fixes; it does not count toward the overall index.

Pelican on a bicycle

Prompt

Generate an SVG of a pelican riding a bicycle

Task origin: Simon Willison

Claude Sonnet 4.5

Claude Sonnet 4.5: Pelican on a bicycle
A community classic for free-form SVG drawing.

Oct 1, 2026 · 30 s · $0.04

Test details
Run date
Oct 1, 2026
API provider
openrouter
Requested API model
anthropic/claude-sonnet-4.5
Reasoning setting
high
Token limit including reasoning
8,192 tokens
Output tokens
2,710 tokens
Cost of the attempt
$0.0408
Response time
30.2 s
API model reported in response
anthropic/claude-sonnet-4.5
Pinned endpoint
Anthropic | anthropic/claude-4.5-sonnet-20250929
Temperature
Provider default
Test protocol
community-visual-tests-v1
Technical checks
Passed, not a quality rating

Visually reviewed. This individual test does not establish overall model quality.

GPT-6 Luna

GPT-6 Luna: Pelican on a bicycle
A community classic for free-form SVG drawing.

Oct 1, 2026 · 47 s · $0.0022

Test details
Run date
Oct 1, 2026
API provider
openrouter
Requested API model
openai/gpt-6-luna
Reasoning setting
high
Token limit including reasoning
8,192 tokens
Output tokens
4,493 tokens
Cost of the attempt
$0.0022
Response time
46.7 s
API model reported in response
openai/gpt-6-luna
Pinned endpoint
OpenAI | openai/gpt-6-luna-20260922
Temperature
Provider default
Test protocol
community-visual-tests-v1
Technical checks
Passed, not a quality rating

Visually reviewed. This individual test does not establish overall model quality.

SVG short test

SVG short test

One SVG task with the same fixed settings for every model, without hidden thinking.

Prompt

Return only one standalone SVG of a pelican riding a bicycle. Use viewBox="0 0 800 600", simple shapes, two clearly visible wheels and a recognizable pelican with a long beak. At most 30 SVG elements and 1800 characters. No Markdown, explanations, comments, scripts, animation, CSS or external resources.

Claude Sonnet 4.5

Claude Sonnet 4.5: SVG short test

Oct 14, 2026 · $0.0105

Test details
Test run
Oct 14, 2026
Provider
anthropic
API model
anthropic/claude-sonnet-4.5
Output
686 tokens
Reasoning
API reports 0 reasoning tokens
Cost of the attempt
$0.0105
Test round
43b8c5c46830

GPT-6 Luna

Unavailable in this round

Claude Sonnet 4.5 and GPT-6 Luna in the overall index

Every model with a place in the overall index, both models of this matchup highlighted. You can add or hide other models.

Overall index (Gradually Meta-Score v4)

20 of 92 models

4 models in this view are measured at a lower reasoning effort than max in the overall index. Dashed column: lower reasoning effort than the top.

Claude Opus 5.5max126.1
Gemini 4 Carbonhigh125.8
Claude Fable 5.1max123.8
Claude Sonnet 5.5max122.8
Gemini 4 Argonhigh122.3
GPT-6 Astramax121.3
GPT-6.1 Solmax119.2
Muse Wonder Fullmax118.3
Claude Opus 5max117.2
Muse Wondermax113.4
Kimi K3.1 Promax112.9
Claude Fable 5max112.5
GPT-6 Solmax110.5
GPT-5.6 Solmax108.7
Muse Spark 1.3max107.4
Gemini 3.7 Flashhigh107.1
DeepSeek V4.1 Flash 1017max106.6
Gemini 3.8 Flashhigh106.5
GPT-6 Lunamax96.3
Claude Sonnet 4.565.4

Popularity compared

How often the models are searched for, used and mentioned, on a scale from 0 to 100.

GPT-6 Luna is more popular than Claude Sonnet 4.5: 60 to 50 out of 100.

Over time

Weekly values from October 18, 2026 to November 7, 2026

Claude Sonnet 4.5GPT-6 Luna

All data side by side

The better value is bold. For the overall index only when the gap is clear.

MetricClaude Sonnet 4.5GPT-6 Luna
Intelligence
Overall indexpoints, 100 = reference group average, higher is better65.496.3
RankRank 71 of 92Rank 35 of 92
Price per 1M tokens
Inputwhat you send$3$0.10above 272,000 tokens: $0.20
Outputwhat the model writes$15$0.50above 272,000 tokens: $0.75
Cost per task (own tests)average of 3 original-protocol tasks both models passed (SVG short test not included)$0.06$0.003
Speed
Tokens per second59101
Popularity
Popularitysearch, usage and mentions, 0 to 10050Rank 102 of 78560Rank 30 of 785
Technical
Context windowhow much text the model reads at once200,000 tokens≈ 300 A4 pages1.05 M tokens≈ 1,580 A4 pages
Knowledge cutoffJanuary 2025May 18, 2026
ReleasedSeptember 2025Sep 22, 2026
AvailabilityDiscontinuedActive
Open weightsnono

Prices without caching or batch discounts · Page count as a rule of thumb from Artificial Analysis

Is there a better choice?

Successor of Sonnet 4.5Claude Sonnet 4.6

Overall index 86.4, rank 44$3 input and $15 output per 1M tokens

GPT-6 Luna vs. Claude Sonnet 4.6
As cheap as GPT-6 LunaClaude Haiku 5.5

Overall index 103.4, rank 20$0.10 input and $0.50 output per 1M tokens

GPT-6 Luna vs. Claude Haiku 5.5
Best model in the overall indexClaude Opus 5.5

Overall index 126.1, rank 1$4 input and $20 output per 1M tokens

GPT-6 Luna vs. Claude Opus 5.5

Shared benchmarks

Single results from the same benchmark version, task and metric. A value is bold only with the same test setup and a clear gap.

A: Claude Sonnet 4.5B: GPT-6 Luna

MedCodeOverall · higher is betterTest setup not documented as identicalClaude Sonnet 4.5: 40.6%GPT-6 Luna: 44.7%Vals AIAs of 10/29/2026
MedScribeOverall · higher is betterTest setup not documented as identicalClaude Sonnet 4.5: 84.5%GPT-6 Luna: 83.7%Vals AIAs of 10/29/2026
MMMU-ProOverall · higher is betterClaude Sonnet 4.5: 65.2%GPT-6 Luna: 62.1%Artificial AnalysisAs of 11/07/2026

More comparisons

Compare Claude Sonnet 4.5 and GPT-6 Luna with the models people compare them with most often.

Compare another matchup

The most popular comparisons

  1. 1GPT-6 Luna vs. GPT-5.6 Terra
  2. 2Claude Haiku 5.5 vs. GPT-6 Luna
  3. 3GPT-6 Luna vs. Gemini 3.8 Flash
  4. 4GPT-6 Luna vs. DeepSeek-V4.1-Flash
  5. 5GPT-6 Luna vs. GPT-5.4 mini
  6. 6GPT-6 Astra vs. GPT-6 Luna
  7. 7GPT-6 Luna vs. GLM-5.3-Flash
  8. 8GPT-6.1 Sol vs. GPT-6 Luna
  9. 9GPT-6 Luna vs. DeepSeek-V4-Pro
Show all 63 comparisons
  1. 10Claude Sonnet 5 vs. GPT-6 Luna
  2. 11GPT-6 Luna vs. Gemini 3.5 Flash-Lite
  3. 12Claude Haiku 4.5 vs. GPT-6 Luna
  4. 13Claude Opus 5.5 vs. Claude Sonnet 4.5
  5. 14Claude Haiku 5.5 vs. Claude Sonnet 4.5
  6. 15Claude Sonnet 4.6 vs. GPT-6 Luna
  7. 16GPT-6 Luna vs. GPT-5.4
  8. 17GPT-6 Luna vs. Gemini 3.1 Pro Preview
  9. 18Claude Sonnet 5.5 vs. GPT-6 Luna
  10. 19GPT-6 Luna vs. DeepSeek V4.1 Flash 1017
  11. 20Claude Opus 4.8 vs. GPT-6 Luna
  12. 21Claude Sonnet 4.5 vs. Gemini 3.8 Flash
  13. 22GPT-6 Luna vs. GPT-5.6 Sol
  14. 23GPT-6 Luna vs. Grok 4.7
  15. 24GPT-6 Luna vs. Gemini 3.6 Flash
  16. 25GPT-6 Sol vs. GPT-6 Luna
  17. 26Claude Opus 4.6 vs. GPT-6 Luna
  18. 27GPT-6 Luna vs. Muse Spark 1.3
  19. 28GPT-6 Luna vs. DeepSeek-V4-Flash
  20. 29Claude Opus 5.5 vs. GPT-6 Luna
  21. 30GPT-6 Luna vs. Qwen 3.8 27B
  22. 31GPT-6 Luna vs. Qwen 3.8 Max 0902
  23. 32Claude Sonnet 4.5 vs. DeepSeek V4.1 Flash 1017
  24. 33GPT-6 Luna vs. GLM-5.2
  25. 34GPT-6 Luna vs. GPT-5.5
  26. 35GPT-6 Luna vs. Gemini 3.7 Flash
  27. 36Claude Sonnet 4.5 vs. GPT-6.1 Sol
  28. 37Claude Sonnet 4.5 vs. Qwen 3.8 27B
  29. 38Claude Sonnet 4.5 vs. Mistral Large 4
  30. 39Claude Fable 5.1 vs. GPT-6 Luna
  31. 40Claude Sonnet 4.5 vs. Grok 4.7
  32. 41GPT-6 Luna vs. GLM-5.3
  33. 42Claude Sonnet 4.5 vs. Mistral Medium 3.5
  34. 43GPT-6 Luna vs. Grok 4.6
  35. 44Claude Opus 4.5 vs. GPT-6 Luna
  36. 45Claude Opus 5 vs. Claude Sonnet 4.5
  37. 46Claude Sonnet 4.5 vs. DeepSeek-V4.1-Flash
  38. 47Claude Sonnet 4.5 vs. Qwen 3.8 Max 0902
  39. 48Claude Sonnet 4.5 vs. GPT-5.6 Luna
  40. 49Claude Sonnet 5.5 vs. Claude Sonnet 4.5
  41. 50GPT-6 Luna vs. MiMo-V2.5
  42. 51Claude Sonnet 4.5 vs. Claude Haiku 4.5
  43. 52Claude Fable 5 vs. GPT-6 Luna
  44. 53GPT-6 Luna vs. Mistral Large 4
  45. 54GPT-6 Luna vs. Gemini 3.5 Flash
  46. 55GPT-6.1 Terra vs. GPT-6 Luna
  47. 56GPT-6 Luna vs. Mistral Medium 3.5
  48. 57GPT-6 Luna vs. Grok 4.5
  49. 58Claude Opus 4.7 vs. GPT-6 Luna
  50. 59Claude Sonnet 4.5 vs. Gemini 4 Argon
  51. 60Claude Opus 4.5 vs. Claude Sonnet 4.5
  52. 61GPT-6 Luna vs. Gemini 4 Argon
  53. 62Claude Sonnet 4.5 vs. Gemini 4 Carbon
  54. 63Claude Sonnet 4.5 vs. Kimi K3.1 Pro