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Opus 5.5

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Anthropic countered the OpenAI competitor with Opus 5.5 in late September Anthropic has Opus DeepSeek V4.1 Flash 1017 scored 75/100 on long-horizon browser use, matching Opus 5.5 Claude Duet precedes Anthropic's November listing Kimi K3.1 Pro benchmark results are approximately level with Opus 5.5 Opus 5.5 stopped ongoing attacks on its own 10 % of the time in replayed logs. Kimi K3.1 Pro is 20 points below Anthropic’s Claude Opus 5.5 on GDPval-AA v2.1 Opus 5.5 solves half the proofs with about 40 % fewer tokens than Opus 5 Claude Duet app uses the Claude Opus 5.5 model Anthropic reduced the Claude Code system prompt for newer models by over 80 percent. Gemini 4 Argon had ~3x launch‑day user share of Opus 5.5 Opus 5.5 uses ~30% fewer tokens than Claude Anthropic released the Opus 5.5 model Claude Platform launches Opus 5.5 Opus 5.5 is capable of building games utilizing the three.js library. Opus 5.5 employs the Scrimshaw Jukebox model for music generation in games. GPT-6 Astra’s sense of fun in games does not match that of Opus 5.5. Gemini 4 Carbon compared with Opus 5.5 on FrontierCode v1.1 (score 51% vs 56%) Opus 5.5 did not provide sufficient capability for Spawn’s autonomous development Drew Breunig used Opus 5.5 prompts to build the NES emulator system Opus 5.5 used the NES CPU conformance tests for the Nintendo Entertainment System· Entity summary generated by Graphiti

RELATIONS
21Relations
CURRENT
20Current
EVENTS
12Events
REPORTS
17Source reports
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Relation timeline

BY VALID-FROM DATE
  1. Drew BreunigUSED PROMPTS FOROpus 5.5

    Drew Breunig used Opus 5.5 prompts to build the NES emulator system

    Current1 sourceDrew Breunig
  2. Opus 5.5USED CONFORMANCE TESTS FORNintendo Entertainment System

    Opus 5.5 used the NES CPU conformance tests for the Nintendo Entertainment System

    Current1 sourceNintendo Entertainment System
  3. Opus 5.5INSUFFICIENT FORSpawn

    Opus 5.5 did not provide sufficient capability for Spawn’s autonomous development

    Current1 sourceSpawn
  4. Gemini 4 CarbonCOMPARED WITHOpus 5.5

    Gemini 4 Carbon compared with Opus 5.5 on FrontierCode v1.1 (score 51% vs 56%)

    Current1 sourceGemini 4 Carbon
  5. Opus 5.5USES MUSIC GENERATION MODELScrimshaw Jukebox

    Opus 5.5 employs the Scrimshaw Jukebox model for music generation in games.

    Current1 sourceScrimshaw Jukebox
  6. GPT-6 AstraHAS LOWER SENSE OF FUN THANOpus 5.5

    GPT-6 Astra’s sense of fun in games does not match that of Opus 5.5.

    Current1 sourceGPT-6 Astra
  7. Opus 5.5USESIdeogram V4.5

    Opus 5.5 is capable of building games utilizing the three.js library.

    Current1 sourceIdeogram V4.5
  8. Claude PlatformLAUNCHESOpus 5.5

    Claude Platform launches Opus 5.5

    Current1 sourceClaude Platform
  9. AnthropicRELEASED MODELOpus 5.5

    Anthropic released the Opus 5.5 model

    Current1 sourceAnthropic
  10. AnthropicREDUCEDOpus 5.5

    Anthropic reduced the Claude Code system prompt for newer models by over 80 percent.

    Current1 sourceAnthropic
  11. Kimi K3.1 ProIS LEVEL WITHOpus 5.5

    Kimi K3.1 Pro benchmark results are approximately level with Opus 5.5

    Current1 sourceKimi K3.1 Pro
  12. Kimi K3.1 ProRANKED BELOW BY POINTSOpus 5.5

    Kimi K3.1 Pro is 20 points below Anthropic’s Claude Opus 5.5 on GDPval-AA v2.1

    Ended 2026-10-241 sourceKimi K3.1 Pro
  13. Opus 5.5IS MORE EFFICIENT THANOpus 5

    Opus 5.5 solves half the proofs with about 40 % fewer tokens than Opus 5

    Current1 sourceOpus 5
  14. Opus 5.5STOP ATTACKS ON 10 PERCENT OF TIMEAnthropic's Mythos

    Opus 5.5 stopped ongoing attacks on its own 10 % of the time in replayed logs.

    Current1 sourceAnthropic's Mythos
  15. Claude DuetUSESOpus 5.5

    Claude Duet app uses the Claude Opus 5.5 model

    Current1 sourceClaude Duet
  16. Claude DuetPRECEDESOpus 5.5

    Claude Duet precedes Anthropic's November listing

    Current1 sourceClaude Duet
  17. Deepseek V4.1-Flash-1017MATCHED SCORE WITHOpus 5.5

    DeepSeek V4.1 Flash 1017 scored 75/100 on long-horizon browser use, matching Opus 5.5

    Current2 sourcesDeepseek V4.1-Flash-1017
  18. Gemini 4 ArgonHAS LAUNCH DAY USER SHAREOpus 5.5

    Gemini 4 Argon had ~3x launch‑day user share of Opus 5.5

    Current1 sourceGemini 4 Argon
  19. Opus 5.5HAS REDUCTION IN TOKENSClaude

    Opus 5.5 uses ~30% fewer tokens than Claude

    Current1 sourceClaude
  20. AnthropicCOUNTERED WITHOpus 5.5

    Anthropic countered the OpenAI competitor with Opus 5.5 in late September

    Current1 sourceAnthropic
  21. AnthropicHASOpus 5.5

    Anthropic has Opus

    Current1 sourceAnthropic

Relations are facts Graphiti extracted from reports, not verbatim quotes. An end date means later reporting showed the relation no longer holds.

Events 12

Source reports 17