Compare / GPT-5.6 Terra vs Inkling Small
GPT-5.6 Terra vs Inkling Small
Which is cheaper, which is more capable, and which does better at each kind of work, from 23 results on 3 sources that measured both models.
GPT-5.6 Terra or Inkling Small? The short answer
- Inkling Small is cheaper: $0.64 against $4.50 per million tokens, 7.1 times less.
- GPT-5.6 Terra scores higher on the Artificial Analysis Intelligence Index: 42.1 against 25.7.
- Inkling Small writes faster: 173 tokens a second against 104.
- On our business benchmarks, GPT-5.6 Terra ranks higher for agents and tool use, reasoning and knowledge, writing and sticking to the facts.
At a glance
| GPT-5.6 Terra | Inkling Small | |
|---|---|---|
| Price per million tokens | $2.00 in · $12.00 out | $0.45 in · $1.20 out |
| Blended (3 in : 1 out) | $4.50 | $0.64 |
| Cheapest host, blended | $2.25 (OpenAI) | – |
| Intelligence Index | 42.1 | 25.7 |
| Spring Prompt overall | – | – |
| Output speed, tokens a second | 104 | 173 |
| 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 Terra | Inkling Small |
|---|---|---|
| Agents and tool useMulti-step tasks with tools: support desks, coding agents, function calls | 16 of 161 | 68 of 161 |
| Professional workReal tasks from banking, consulting and law, business documents and freelance projects | 10 of 51 | not measured |
| Reasoning and knowledgeHard questions across science, maths and general knowledge | 20 of 195 | 58 of 195 |
| WritingWhat people prefer in blind comparisons, and judged writing quality | 39 of 187 | 100 of 187 |
| Sticking to the factsSummarising without inventing things, and factual answers | 49 of 153 | 126 of 153 |
| Speed under pressureGood decisions against a real clock (fast chess) | not measured | 4 of 21 |
Every shared result
| Benchmark | Metric | GPT-5.6 Terra | Inkling Small |
|---|---|---|---|
| Arena (formerly LMArena)reported | Confirmed task successIPS effect estimate | -0.06 | -0.21 |
| Arena (formerly LMArena)reported | Praise over complaintIPS effect estimate | 0.03 | -0.21 |
| Arena (formerly LMArena)reported | SteerabilityIPS effect estimate | 0.04 | -0.12 |
| Arena (formerly LMArena)reported | Tool groundingIPS effect estimate | 0.00 | -0.00 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,467 | 1,425 |
| Arena (formerly LMArena)reported | Business, management and financeArena rating | 1,466 | 1,408 |
| Arena (formerly LMArena)reported | Creative writingArena rating | 1,428 | 1,313 |
| Arena (formerly LMArena)reported | Expert promptsArena rating | 1,504 | 1,445 |
| Arena (formerly LMArena)reported | Instruction followingArena rating | 1,462 | 1,393 |
| Arena (formerly LMArena)reported | OverallArena rating | 1,465 | 1,405 |
| Arena (formerly LMArena)reported | Writing, literature and languageArena rating | 1,445 | 1,344 |
| Artificial Analysisreported | Artificial Analysis Coding Indexindex score | 76.7 | 52.9 |
| Artificial Analysisreported | Artificial Analysis Intelligence Indexindex score | 42.1 | 25.7 |
| Artificial Analysisreported | GPQA Diamond% of questions | 92.5% | 89.5% |
| Artificial Analysisreported | Humanity's Last Exam% of questions | 42.9% | 33.3% |
| Artificial Analysisreported | Long-context reasoning (AA-LCR)% of questions | 83.0% | 75.7% |
| Artificial Analysisreported | Output speedtokens per second | 104 | 173 |
| Artificial Analysisreported | SciCode% of problems | 55.0% | 49.7% |
| Artificial Analysisreported | Terminal-Bench 2.1% of tasks | 88.0% | 55.1% |
| Artificial Analysisreported | Terminal-Bench 4.0% of tasks | 35.4% | 1.0% |
| Artificial Analysisreported | Time to first answer tokenseconds | 0.72 | 13.6 |
| Artificial Analysisreported | Τ-bench banking% of tasks | 40.2% | 18.8% |
| SimpleQA Verified (Epoch AI)reported | Correct answers% of questions | 43.2% | 19.1% |
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 Terra better than Inkling Small?
It depends on the task. Among models available today, on our benchmarks and licensed sources, GPT-5.6 Terra ranks higher for agents and tool use, reasoning and knowledge, writing and sticking to the facts.
Which is cheaper, GPT-5.6 Terra or Inkling Small?
Inkling Small costs $0.64 per million tokens (three input to one output), against $4.50 for GPT-5.6 Terra.
Which is faster, GPT-5.6 Terra or Inkling Small?
Inkling Small writes about 173 tokens a second on its usual API, against 104 for GPT-5.6 Terra (Artificial Analysis).
Run GPT-5.6 Terra and Inkling Small on your own prompt
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