Compare / GPT-5.6 Luna vs Inkling
GPT-5.6 Luna vs Inkling
Which is cheaper, which is more capable, and which does better at each kind of work, from 21 results on 3 sources that measured both models.
GPT-5.6 Luna or Inkling? The short answer
- GPT-5.6 Luna is cheaper: $0.45 against $1.72 per million tokens, 3.8 times less.
- GPT-5.6 Luna scores higher on the Artificial Analysis Intelligence Index: 37.3 against 25.0.
- On our business benchmarks, GPT-5.6 Luna ranks higher for agents and tool use, professional work, reasoning and knowledge, writing and sticking to the facts.
At a glance
| GPT-5.6 Luna | Inkling | |
|---|---|---|
| Price per million tokens | $0.20 in · $1.20 out | $0.95 in · $4.05 out |
| Blended (3 in : 1 out) | $0.45 | $1.72 |
| Cheapest host, blended | $0.23 (OpenAI) | $1.72 (DeepInfra, FP8) |
| Intelligence Index | 37.3 | 25.0 |
| Spring Prompt overall | – | – |
| Output speed, tokens a second | – | 166 |
| Context window | 1,050,000 tokens | 524,288 tokens |
| Weights | Closed | Open |
| Developer based in | the US | the US |
Prices are the developer's list price where we have read it, otherwise the typical host on OpenRouter; see every model's price. Intelligence and speed from Artificial Analysis.
Which is better for what
Each model's rank among models available today, for each kind of work, from our own benchmarks and licensed sources. The better rank is in green.
| Use case | GPT-5.6 Luna | Inkling |
|---|---|---|
| Agents and tool useMulti-step tasks with tools: support desks, coding agents, function calls | 47 of 161 | 56 of 161 |
| Professional workReal tasks from banking, consulting and law, business documents and freelance projects | 20 of 51 | 45 of 51 |
| Reasoning and knowledgeHard questions across science, maths and general knowledge | 38 of 195 | 64 of 195 |
| WritingWhat people prefer in blind comparisons, and judged writing quality | 57 of 187 | 59 of 187 |
| Sticking to the factsSummarising without inventing things, and factual answers | 59 of 153 | 75 of 153 |
Every shared result
| Benchmark | Metric | GPT-5.6 Luna | Inkling |
|---|---|---|---|
| Arena (formerly LMArena)reported | Confirmed task successIPS effect estimate | -0.05 | -0.22 |
| Arena (formerly LMArena)reported | Praise over complaintIPS effect estimate | -0.04 | -0.22 |
| Arena (formerly LMArena)reported | SteerabilityIPS effect estimate | 0.02 | -0.12 |
| Arena (formerly LMArena)reported | Tool groundingIPS effect estimate | 0.00 | -0.00 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,461 | 1,452 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,463 | 1,444 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,412 | 1,384 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,491 | 1,474 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,446 | 1,427 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,454 | 1,442 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,435 | 1,403 |
| Artificial Analysisreported | Artificial Analysis Coding Indexindex score | 71.4 | 52.1 |
| Artificial Analysisreported | Artificial Analysis Intelligence Indexindex score | 37.3 | 25.0 |
| Artificial Analysisreported | GPQA Diamond% of questions | 91.1% | 87.2% |
| Artificial Analysisreported | Humanity's Last Exam% of questions | 39.5% | 31.9% |
| Artificial Analysisreported | Long-context reasoning (AA-LCR)% of questions | 83.7% | 77.3% |
| Artificial Analysisreported | SciCode% of problems | 53.6% | 47.0% |
| Artificial Analysisreported | Terminal-Bench 2.1% of tasks | 80.9% | 55.1% |
| Artificial Analysisreported | Terminal-Bench 4.0% of tasks | 11.6% | 1.0% |
| Artificial Analysisreported | Τ-bench banking% of tasks | 31.1% | 29.1% |
| SimpleQA Verified (Epoch AI)reported | Correct answers% of questions | 41.0% | 40.3% |
Bold green marks the better value on that metric. Where a source reports ranges that overlap, the difference may not be meaningful; see the benchmark page for ranges.
Quick answers
Is GPT-5.6 Luna better than Inkling?
It depends on the task. Among models available today, on our benchmarks and licensed sources, GPT-5.6 Luna ranks higher for agents and tool use, professional work, reasoning and knowledge, writing and sticking to the facts.
Which is cheaper, GPT-5.6 Luna or Inkling?
GPT-5.6 Luna costs $0.45 per million tokens (three input to one output), against $1.72 for Inkling.
Run GPT-5.6 Luna and Inkling on your own prompt
Benchmarks aren't your data. Try both side by side in the playground, with the cost of every answer.