Claude Opus 5.5vs.GPT-6.1 Terra
Which one is better?
Claude Opus 5.5 is clearly ahead in the overall index, but costs 4 times as much per token.
96
Claude Opus 5.5
Rank 1 to 2
67
GPT-6.1 Terra
Rank 12 to 27
98
Claude Opus 5.5
fairly fast
91
GPT-6.1 Terra
fairly slow
$8
Claude Opus 5.5
expensive
$2
GPT-6.1 Terra
fairly expensive
Claude Opus 5.5
- Subscription
At Anthropic from €21.42 a month (Claude Pro). Through other providers from ≈ €6.36 a month (ElevenLabs Starter, with limited credits). 70 plans in Germany.
- Via API
$4 input, $20 output per 1M tokens, unchanged since Sep 24, 2026.
GPT-6.1 Terra
- Subscription
Subscriptions in Germany: n/a
- Via API
$1 input, $5 output per 1M tokens.
Overall index with data through Oct 29, 2026 · Prices from Oct 29, 2026 · Speed: measured by Artificial Analysis · Subscriptions as of Oct 24, 2026 · Subscription prices incl. VAT
Where is the difference?
Values from 0 to 100 per task area. We only name a winner when the gap is large enough and there are enough tests.
Opus 5.5 ahead: 7GPT-6.1 Terra ahead: 0level: 0too little data: 3of 10 areas
AreaOpus 5.5GPT-6.1 Terra0 to 100, higher is betterResult
Areas in the overall index
CodingOpus 5.5 aheadOpus 5.5: 98GPT-6.1 Terra: 84
ReasoningOpus 5.5 aheadOpus 5.5: 95GPT-6.1 Terra: 88
Mathematicsonly Opus 5.5 has a scoreOpus 5.5: above 99GPT-6.1 Terra: not enough data
KnowledgeOpus 5.5 aheadOpus 5.5: above 99GPT-6.1 Terra: 80
AgentsOpus 5.5 aheadOpus 5.5: 86GPT-6.1 Terra: 57
Generalonly Opus 5.5 has a scoreOpus 5.5: 94GPT-6.1 Terra: not enough data
MultimodalOpus 5.5 aheadOpus 5.5: 93GPT-6.1 Terra: 70
Specialist fields
FinanceOpus 5.5 aheadOpus 5.5: 92GPT-6.1 Terra: 45
LegalOpus 5.5 aheadOpus 5.5: 92GPT-6.1 Terra: 8
Healthonly Opus 5.5 has a scoreOpus 5.5: 91GPT-6.1 Terra: not enough data
Show 4 more areas that do not count toward the overall index
AreaOpus 5.5GPT-6.1 Terra0 to 100, higher is betterResult
Cybersecurityonly Opus 5.5 has a scoreOpus 5.5: 84GPT-6.1 Terra: not enough data
Searchonly Opus 5.5 has a scoreOpus 5.5: 84GPT-6.1 Terra: not enough data
Productivityonly Opus 5.5 has a scoreOpus 5.5: 95GPT-6.1 Terra: not enough data
Educationonly Opus 5.5 has a scoreOpus 5.5: 97GPT-6.1 Terra: not enough data
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
A community classic for free-form SVG drawing.
Claude Opus 5.5
Reasoning (requested): high
Current attempt
- Run date
- Oct 1, 2026
- API provider
- openrouter
- Requested API model
- anthropic/claude-opus-5.5
- API model reported in response
- anthropic/claude-opus-5.5
- Reasoning setting
- high
- Pinned endpoint
- Anthropic | anthropic/claude-opus-5.5-20260921
- Temperature
- Provider default
- Token limit including reasoning
- 8,192 tokens
- Test protocol
- community-visual-tests-v1
- Technical checks
- Passed, not a quality rating
- Response time
- 33.2 s
Visually reviewed. This individual test does not establish overall model quality.
GPT-6.1 Terra
Not tested yet
Prompt and test conditions
Generate an SVG of a pelican riding a bicycle
Token limit including reasoning: 8,192 tokens
Task origin (Simon Willison)SVG short test
There is no shared test round for this selection. Results from different rounds are not mixed.
All data side by side
The better value is bold. For the overall index only when the gap is clear.
| Metric | Claude Opus 5.5 | GPT-6.1 Terra |
|---|---|---|
| Intelligence | ||
| Overall index0 to 100, higher is better | 96 | 67 |
| Rank | Rank 1 to 2 of 95 | Rank 12 to 27 of 95 |
| Price per 1M tokens | ||
| Inputwhat you send | $4 | $1above 272,000 tokens: $2 |
| Outputwhat the model writes | $20 | $5above 272,000 tokens: $7.50 |
| Speed | ||
| Tokens per second | 98 | 91 |
| Technical | ||
| Context windowhow much text the model reads at once | 1 M tokens≈ 1,500 A4 pages | 1.05 M tokens≈ 1,580 A4 pages |
| Knowledge cutoff | June 2026 | Jun 1, 2026 |
| Released | Sep 22, 2026 | Oct 26, 2026 |
| Availability | Active | Active |
| Open weights | no | no |
- GPT-6.1 Terra, 12-hour cache write: The table's cache-write rate covers 30-minute retention. With 12-hour retention it is $2.50 per 1M tokens through 272,000 input tokens, $5 above. Source
- GPT-6.1 Terra, Long-context billing: Above 272,000 input tokens, the higher rates apply to the entire request. Input and cache rates double, while output costs 1.5 times the standard rate. Source
- GPT-6.1 Terra, Batch and Flex pricing: 50% off standard pricing Source
- GPT-6.1 Terra, Fast pricing: Fast mode costs twice the standard price Source
- GPT-6.1 Terra, Regional processing: 10% surcharge over standard processing Source
Prices without caching or batch discounts · Page count as a rule of thumb from Artificial Analysis
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 Opus 5.5B: GPT-6.1 Terra
EMB v1.1Overall · higher is betterTest setup not documented as identicalClaude Opus 5.5: 75.8%GPT-6.1 Terra: 73.3%Vals AIAs of 10/26/2026
Finance Agent v2.1Overall · higher is betterTest setup not documented as identicalClaude Opus 5.5: 67.8%GPT-6.1 Terra: 56%Vals AIAs of 10/26/2026
HLAB-Vals-1.1Overall · Task fully resolved · higher is betterTest setup not documented as identicalClaude Opus 5.5: 9.2%GPT-6.1 Terra: 1.7%Vals AIAs of 10/26/2026
Legal Research BenchOverall · All-pass · higher is betterTest setup not documented as identicalClaude Opus 5.5: 50.5%GPT-6.1 Terra: 26%Vals AIAs of 10/26/2026
Tax Agent BenchOverall · higher is betterTest setup not documented as identicalClaude Opus 5.5: 45.6%GPT-6.1 Terra: 15.2%Vals AIAs of 10/26/2026
Terminal-Bench 4.0Overall · higher is betterTest setup not documented as identicalClaude Opus 5.5: 65.2%GPT-6.1 Terra: 49.5%Vals AIAs of 10/26/2026
Vals Finance IndexOverall · higher is betterTest setup not documented as identicalClaude Opus 5.5: 65.6%GPT-6.1 Terra: 52.9%Vals AIAs of 10/26/2026
Vals IndexOverall · higher is betterTest setup not documented as identicalClaude Opus 5.5: 70.2%GPT-6.1 Terra: 60.5%Vals AIAs of 10/27/2026
Vals Legal IndexOverall · higher is betterTest setup not documented as identicalClaude Opus 5.5: 72.3%GPT-6.1 Terra: 58.6%Vals AIAs of 10/26/2026
Vibe Code Bench v1.1Overall · higher is betterTest setup not documented as identicalClaude Opus 5.5: 90.3%GPT-6.1 Terra: 84%Vals AIAs of 10/26/2026
Show 54 more benchmarks
EMB v1.1Comps · higher is betterTest setup not documented as identicalClaude Opus 5.5: 75.7%GPT-6.1 Terra: 75.6%Vals AIAs of 10/26/2026
Finance Agent v2.1Adjustments · higher is betterTest setup not documented as identicalClaude Opus 5.5: 67.1%GPT-6.1 Terra: 50.6%Vals AIAs of 10/26/2026
HLAB-Vals-1.1Antitrust Competition · Criteria passed · higher is betterTest setup not documented as identicalClaude Opus 5.5: 88.4%GPT-6.1 Terra: 83%Vals AIAs of 10/26/2026
Legal Research BenchAdministrative / Regulatory · All-pass · higher is betterTest setup not documented as identicalClaude Opus 5.5: 65.2%GPT-6.1 Terra: 45.5%Vals AIAs of 10/26/2026
Tax Agent BenchControversy & Precedence Analysis · higher is betterTest setup not documented as identicalClaude Opus 5.5: 30%GPT-6.1 Terra: 5.9%Vals AIAs of 10/26/2026
Terminal-Bench 4.0Hardware · higher is betterTest setup not documented as identicalClaude Opus 5.5: 60%GPT-6.1 Terra: 26.7%Vals AIAs of 10/26/2026
Vals Finance IndexEMB v1.1 · higher is betterTest setup not documented as identicalClaude Opus 5.5: 75.8%GPT-6.1 Terra: 73.3%Vals AIAs of 10/26/2026
Vals IndexCode Migration v1.1 · higher is betterTest setup not documented as identicalClaude Opus 5.5: 80.5%GPT-6.1 Terra: 72.2%Vals AIAs of 10/27/2026
Vals Legal IndexBusiness & Commercial · higher is betterTest setup not documented as identicalClaude Opus 5.5: 69.2%GPT-6.1 Terra: 51.6%Vals AIAs of 10/26/2026
EMB v1.1Dataroom · higher is betterTest setup not documented as identicalClaude Opus 5.5: 86.2%GPT-6.1 Terra: 86.3%Vals AIAs of 10/26/2026
Finance Agent v2.1All-Pass · higher is betterTest setup not documented as identicalClaude Opus 5.5: 56.3%GPT-6.1 Terra: 42.6%Vals AIAs of 10/26/2026
HLAB-Vals-1.1Antitrust Competition · Task fully resolved · higher is betterTest setup not documented as identicalClaude Opus 5.5: 0%GPT-6.1 Terra: 0%Vals AIAs of 10/26/2026
Legal Research BenchAdministrative / Regulatory · Weighted partial credit · higher is betterTest setup not documented as identicalClaude Opus 5.5: 85.4%GPT-6.1 Terra: 84.8%Vals AIAs of 10/26/2026
Tax Agent BenchControversy & Precedence Analysis · higher is betterTest setup not documented as identicalClaude Opus 5.5: 66.9%GPT-6.1 Terra: 42.5%Vals AIAs of 10/26/2026
Terminal-Bench 4.0Media · higher is betterTest setup not documented as identicalClaude Opus 5.5: 75%GPT-6.1 Terra: 58.3%Vals AIAs of 10/26/2026
Vals Finance IndexFinance Agent v2.1 · higher is betterTest setup not documented as identicalClaude Opus 5.5: 67.8%GPT-6.1 Terra: 56%Vals AIAs of 10/26/2026
Vals IndexEMB v1.1 · higher is betterTest setup not documented as identicalClaude Opus 5.5: 75.8%GPT-6.1 Terra: 73.3%Vals AIAs of 10/27/2026
Vals Legal IndexCivil Negligence · higher is betterTest setup not documented as identicalClaude Opus 5.5: 70.2%GPT-6.1 Terra: 50.5%Vals AIAs of 10/26/2026
EMB v1.1DCF · higher is betterTest setup not documented as identicalClaude Opus 5.5: 69.9%GPT-6.1 Terra: 64.3%Vals AIAs of 10/26/2026
Finance Agent v2.1Comparables · higher is betterTest setup not documented as identicalClaude Opus 5.5: 57.3%GPT-6.1 Terra: 50.4%Vals AIAs of 10/26/2026
HLAB-Vals-1.1Arbitration International Dispute Resolution · Criteria passed · higher is betterTest setup not documented as identicalClaude Opus 5.5: 91.6%GPT-6.1 Terra: 88.4%Vals AIAs of 10/26/2026
Legal Research BenchBusiness & Commercial · All-pass · higher is betterTest setup not documented as identicalClaude Opus 5.5: 48.8%GPT-6.1 Terra: 16.3%Vals AIAs of 10/26/2026
Tax Agent BenchCurrent & Temporal Analysis · higher is betterTest setup not documented as identicalClaude Opus 5.5: 46.6%GPT-6.1 Terra: 22.1%Vals AIAs of 10/26/2026
Terminal-Bench 4.0ML · higher is betterTest setup not documented as identicalClaude Opus 5.5: 81.8%GPT-6.1 Terra: 42.4%Vals AIAs of 10/26/2026
Vals Finance IndexTax Agent Bench · higher is betterTest setup not documented as identicalClaude Opus 5.5: 45.6%GPT-6.1 Terra: 15.2%Vals AIAs of 10/26/2026
Vals IndexFinance Agent v2.1 · higher is betterTest setup not documented as identicalClaude Opus 5.5: 67.8%GPT-6.1 Terra: 56%Vals AIAs of 10/27/2026
Vals Legal IndexCriminal · higher is betterTest setup not documented as identicalClaude Opus 5.5: 62.7%GPT-6.1 Terra: 51.3%Vals AIAs of 10/26/2026
EMB v1.1LBO · higher is betterTest setup not documented as identicalClaude Opus 5.5: 68.3%GPT-6.1 Terra: 64.1%Vals AIAs of 10/26/2026
Finance Agent v2.1Disclosure Analysis · higher is betterTest setup not documented as identicalClaude Opus 5.5: 74.4%GPT-6.1 Terra: 64.2%Vals AIAs of 10/26/2026
HLAB-Vals-1.1Arbitration International Dispute Resolution · Task fully resolved · higher is betterTest setup not documented as identicalClaude Opus 5.5: 10%GPT-6.1 Terra: 0%Vals AIAs of 10/26/2026
Legal Research BenchBusiness & Commercial · Weighted partial credit · higher is betterTest setup not documented as identicalClaude Opus 5.5: 71%GPT-6.1 Terra: 75.9%Vals AIAs of 10/26/2026
Tax Agent BenchCurrent & Temporal Analysis · higher is betterTest setup not documented as identicalClaude Opus 5.5: 73.3%GPT-6.1 Terra: 53.1%Vals AIAs of 10/26/2026
Terminal-Bench 4.0Operations · higher is betterTest setup not documented as identicalClaude Opus 5.5: 29.6%GPT-6.1 Terra: 40.7%Vals AIAs of 10/26/2026
Vals IndexHLAB-Vals-1.1 · higher is betterTest setup not documented as identicalClaude Opus 5.5: 9.2%GPT-6.1 Terra: 1.7%Vals AIAs of 10/27/2026
Vals Legal IndexFamily · higher is betterTest setup not documented as identicalClaude Opus 5.5: 22.7%GPT-6.1 Terra: 4.5%Vals AIAs of 10/26/2026
EMB v1.1M&A · higher is betterTest setup not documented as identicalClaude Opus 5.5: 82.1%GPT-6.1 Terra: 80.7%Vals AIAs of 10/26/2026
Finance Agent v2.1Earnings Analysis · higher is betterTest setup not documented as identicalClaude Opus 5.5: 88.9%GPT-6.1 Terra: 83%Vals AIAs of 10/26/2026
HLAB-Vals-1.1Banking Finance · Criteria passed · higher is betterTest setup not documented as identicalClaude Opus 5.5: 74.3%GPT-6.1 Terra: 90.1%Vals AIAs of 10/26/2026
Legal Research BenchCivil Litigation · All-pass · higher is betterTest setup not documented as identicalClaude Opus 5.5: 48.1%GPT-6.1 Terra: 14.8%Vals AIAs of 10/26/2026
Tax Agent BenchFact-Pattern Analysis · higher is betterTest setup not documented as identicalClaude Opus 5.5: 46.5%GPT-6.1 Terra: 16.1%Vals AIAs of 10/26/2026
Terminal-Bench 4.0Science · higher is betterTest setup not documented as identicalClaude Opus 5.5: 71.4%GPT-6.1 Terra: 54.8%Vals AIAs of 10/26/2026
Vals IndexLegal Research · higher is betterTest setup not documented as identicalClaude Opus 5.5: 50.5%GPT-6.1 Terra: 26%Vals AIAs of 10/27/2026
Vals Legal IndexHLAB Criteria Pass · higher is betterTest setup not documented as identicalClaude Opus 5.5: 89.8%GPT-6.1 Terra: 87.2%Vals AIAs of 10/26/2026
EMB v1.1Misc · higher is betterTest setup not documented as identicalClaude Opus 5.5: 71%GPT-6.1 Terra: 67.5%Vals AIAs of 10/26/2026
Finance Agent v2.1Financial Modeling · higher is betterTest setup not documented as identicalClaude Opus 5.5: 57%GPT-6.1 Terra: 35.1%Vals AIAs of 10/26/2026
HLAB-Vals-1.1Banking Finance · Task fully resolved · higher is betterTest setup not documented as identicalClaude Opus 5.5: 0%GPT-6.1 Terra: 0%Vals AIAs of 10/26/2026
Legal Research BenchCivil Litigation · Weighted partial credit · higher is betterTest setup not documented as identicalClaude Opus 5.5: 74%GPT-6.1 Terra: 80.6%Vals AIAs of 10/26/2026
Tax Agent BenchFact-Pattern Analysis · higher is betterTest setup not documented as identicalClaude Opus 5.5: 72.9%GPT-6.1 Terra: 47.2%Vals AIAs of 10/26/2026
Terminal-Bench 4.0Security · higher is betterTest setup not documented as identicalClaude Opus 5.5: 100%GPT-6.1 Terra: 80%Vals AIAs of 10/26/2026
Vals IndexTax Agent · higher is betterTest setup not documented as identicalClaude Opus 5.5: 45.6%GPT-6.1 Terra: 15.2%Vals AIAs of 10/27/2026
Vals Legal IndexLabor & Employment · higher is betterTest setup not documented as identicalClaude Opus 5.5: 85.2%GPT-6.1 Terra: 82.4%Vals AIAs of 10/26/2026
EMB v1.1Operating · higher is betterTest setup not documented as identicalClaude Opus 5.5: 77.7%GPT-6.1 Terra: 74.8%Vals AIAs of 10/26/2026
Finance Agent v2.1General Qualitative Analysis · higher is betterTest setup not documented as identicalClaude Opus 5.5: 73.2%GPT-6.1 Terra: 63.8%Vals AIAs of 10/26/2026
HLAB-Vals-1.1Bankruptcy Restructuring · Criteria passed · higher is betterTest setup not documented as identicalClaude Opus 5.5: 87.5%GPT-6.1 Terra: 83.4%Vals AIAs of 10/26/2026
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