SI Index Data as of Oct 8, 2026

Claude Opus 4: Price, Context, Benchmarks, and Release Details

Anthropic provisional listing · first seen Oct 8, 2026 · score computed Oct 8, 2026, 22:13 UTC
54.8
SI Score (method si-v2-absolute-shrinkage-1)
#78 of 115 ranked
96% confidence 96 percent, High confidence — 4 of 7 expected sources in
Coverage 76% of expected source weight · 100% confidence at 80% coverage

Pillar breakdown

Coding (weight 40 percent) 71.1
Math (weight 15 percent) 70.8
Preference (weight 15 percent) 69.6
Reasoning (weight 30 percent) 22.6

Pillar weights: reasoning 30% · math 15% · coding 40% · preference 15%. Benchmark results use fixed 0–100 scales before averaging; incomplete evidence is shrunk toward 50.

Facts

Input price / 1M
not yet reported
Output price / 1M
not yet reported
Context window
200Kmodels.devPublished source fact Retrieved Oct 8, 2026 · MIT
Open source ↗
Max output
32Kmodels.devPublished source fact Retrieved Oct 8, 2026 · MIT
Open source ↗
Released
May 22, 2025models.devPublished source fact Retrieved Oct 8, 2026 · MIT
Open source ↗
Open weights
Nomodels.devPublished source fact Retrieved Oct 8, 2026 · MIT
Open source ↗
License
not yet reported
Input modalities
text, image, pdfmodels.devPublished source fact Retrieved Oct 8, 2026 · MIT
Open source ↗

Benchmark results

23 results
Benchmark Raw result Normalized (0–100) Pillar
aider polyglot 72%Aider polyglotPublished source fact [variant] Aider polyglot; 225 cases; 2 attemptsPublished May 25, 2025 Retrieved Oct 8, 2026 · Apache-2.0
Open source ↗ 		72.0 coding
arc agi v1 public eval 35.5%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514Published Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		35.5 reasoning
arc agi v1 public eval 54.3%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514-thinking-16kPublished Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		54.3 reasoning
arc agi v1 public eval 43.3%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514-thinking-1kPublished Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		43.3 reasoning
arc agi v1 public eval 45.6%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514-thinking-8kPublished Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		45.6 reasoning
arc agi v1 semi private 22.5%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514Published Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		22.5 reasoning
arc agi v1 semi private 35.7%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514-thinking-16kPublished Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		35.7 reasoning
arc agi v1 semi private 27%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514-thinking-1kPublished Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		27.0 reasoning
arc agi v1 semi private 30.7%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514-thinking-8kPublished Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		30.7 reasoning
arc agi v2 public eval 1.3%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514Published Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		1.3 reasoning
arc agi v2 public eval 3.3%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514-thinking-16kPublished Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		3.3 reasoning
arc agi v2 public eval 0.4%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514-thinking-1kPublished Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		0.4 reasoning
arc agi v2 public eval 2.5%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514-thinking-8kPublished Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		2.5 reasoning
arc agi v2 semi private 1.3%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514Published Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		1.3 reasoning
arc agi v2 semi private 8.6%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514-thinking-16kPublished Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		8.6 reasoning
arc agi v2 semi private 0%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514-thinking-1kPublished Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		0.0 reasoning
arc agi v2 semi private 4.5%ARC PrizeARC Prize steward-published result; exact edition/subset; publication time is HTTP Last-Modified of the aggregate export, not the evaluation date. [variant] claude-opus-4-20250514-thinking-8kPublished Oct 6, 2026 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		4.5 reasoning
gpqa diamond 69.2%Epoch AI BenchmarkingEpoch-owned evaluation mean score; scores only, no benchmark questions [variant] Published May 22, 2025 Retrieved Oct 8, 2026 · CC-BY
Open source ↗ 		69.2 reasoning
hle scale 10.7%Humanity’s Last ExamPotential contamination warning: This model was evaluated after the public release of HLE, allowing model builder access to the prompts and solutions. [variant] Published May 24, 2025 Retrieved Oct 8, 2026 · factual citation
Open source ↗ 		10.7 reasoning
lmarena text 1365.7 eloLMArena / ArenaPublished source fact [variant] text / overallPublished Oct 2, 2026 Retrieved Oct 8, 2026 · CC-BY-4.0
Open source ↗ 		69.6 preference
math level 5 85.0%Epoch AI BenchmarkingEpoch-owned evaluation mean score; scores only, no benchmark questions [variant] Published May 22, 2025 Retrieved Oct 8, 2026 · CC-BY
Open source ↗ 		85.0 math
otis mock aime 2024 2025 42.2%Epoch AI BenchmarkingEpoch-owned evaluation mean score; scores only, no benchmark questions [variant] Published May 22, 2025 Retrieved Oct 8, 2026 · CC-BY
Open source ↗ 		42.2 math
swe bench verified 70.7%Epoch AI BenchmarkingEpoch-owned evaluation mean score; scores only, no benchmark questions [variant] Published Feb 6, 2026 Retrieved Oct 8, 2026 · CC-BY
Open source ↗ 		70.7 coding

Normalization uses fixed absolute 0–100 scales for each unit, independently of other models that have a result on each benchmark. Coverage and evidence breadth still affect the composite; compare the evaluation conditions before reading a small score gap as decisive. “lab-reported” marks the provider's own published figure.

Sources: in and pending

in Reported (4)

  • ARC Prize · arrived Oct 8, 2026
  • Epoch AI Benchmarking · arrived Oct 8, 2026
  • Humanity’s Last Exam · arrived Oct 8, 2026
  • LMArena / Arena · arrived Oct 8, 2026

pending Awaiting (3)

  • Official model cards via models.dev · carries 4% of expected weight
  • LiveBench · carries 13% of expected weight
  • Terminal-Bench · carries 6% of expected weight

The confidence % rises as pending sources publish. Some sources never cover some models — that is why 100% confidence arrives at 80% of expected weight, not at full coverage.