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Comparison of command-a, Anthropic: Claude Sonnet 5.5, OpenAI: GPT-6 Luna
3 modelsUnknowncommand-aRemove ×anthropicAnthropic: Claude Sonnet 5.5Remove ×openaiOpenAI: GPT-6 LunaRemove ×
What’s different256K context · 8.2K max output · Tool calling · Structured outputTuned for quick iteration on scoped fixes and documents; Anthropic favors Opus 5.5 for open-ended work needing sustained judgment.Can turn reasoning off for high-volume requests; Chat Completions tool calls require reasoning_effort=none.
DateOct 16, 2026DiscoveredSep 28, 2026ReleasedSep 22, 2026Released
Listed rate$2.50 in / $10.00 out/ 1M tokensExperiential · all routes ↗Standard list rate$2.00 in / $10.00 out/ 1M tokensAmazon Bedrock · via OpenRouter · all routes ↗amazon-bedrock$0.05 in / $0.25 out/ 1M tokensOpenAI · via OpenRouter · all routes ↗openai/flex · tier=flex · prompt ≤ 272000 tokens
Provider endpoints1 endpoint →11 endpoints →9 endpoints →
AA Intelligence ↗4.3.2Not reported56 ↗Effort: max · Max, Default FallbackIndependent result38.12 ↗Effort: max · MaxIndependent result
AA-Briefcase ↗1.1Not reported1,816.92 ↗Effort: max · Max, Default FallbackIndependent result1,334.66 ↗Effort: max · MaxIndependent result
GDPval-AA ↗2.1Not reported1,837.82 ↗Effort: max · Max, Default FallbackIndependent result1,431.02 ↗Effort: max · MaxIndependent result
AutomationBench-AA ↗AA Index 4.3.2 collectionNot reported71.77% ↗Effort: max · Max, Default FallbackIndependent result53.17% ↗Effort: max · MaxIndependent result
Terminal-Bench 4.0 · AA ↗Not reported63.64% ↗Effort: max · Max, Default FallbackHarness unreportedIndependent result12.63% ↗Effort: max · MaxHarness unreportedIndependent result
SciCode ↗AA Index 4.3.2 collectionNot reported61% ↗AA · Under reviewEffort: max · Max, Default FallbackIndependent result54.63% ↗AA · Under reviewEffort: max · MaxIndependent result
Humanity’s Last Exam ↗AA Index 4.3.2 collectionNot reported54.96% ↗Effort: max · Max, Default FallbackIndependent result38.51% ↗Effort: max · MaxIndependent result
GDP.pdf ↗AA Index 4.3.2 collectionNot reported25.8% ↗Effort: max · Max, Default FallbackIndependent result22.8% ↗Effort: max · MaxIndependent result
CritPt ↗AA Index 4.3.2 collectionNot reported31.43% ↗AA · Under reviewEffort: max · Max, Default FallbackIndependent result19.43% ↗AA · Under reviewEffort: max · MaxIndependent result
AA-Omniscience ↗AA Index 4.3.2 collectionNot reported32.3 ↗Effort: max · Max, Default FallbackIndependent result0.65 ↗Effort: max · MaxIndependent result
AA-LCR ↗1.1Not reported82.67% ↗Effort: max · Max, Default FallbackIndependent result83.33% ↗Effort: max · MaxIndependent result
LiveBench ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported82.46% ↗Effort: max · single run · equal mean of 7 suitesIndependent result69.4% ↗Effort: max · single run · equal mean of 7 suitesIndependent result
LiveBench Design ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported85% ↗Effort: max · single runIndependent result82.5% ↗Effort: max · single runIndependent result
LiveBench Research ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported83.6% ↗Effort: max · single runIndependent result43.5% ↗Effort: max · single runIndependent result
LiveBench Browser Use ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported84% ↗Effort: max · single runIndependent result72% ↗Effort: max · single runIndependent result
LiveBench Coding ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported94.7% ↗Effort: max · single runIndependent result84.5% ↗Effort: max · single runIndependent result
LiveBench Agentic ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported78.8% ↗Effort: max · single runIndependent result48.1% ↗Effort: max · single runIndependent result
LiveBench Data Analysis ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported59.5% ↗Effort: max · single runIndependent result73.4% ↗Effort: max · single runIndependent result
LiveBench Reasoning ↗2.0 · 2026-10-14 (dataset 2026-09-02)Not reported91.6% ↗Effort: max · single runIndependent result81.8% ↗Effort: max · single runIndependent result
Context window256K1M1.1M
Max output8.2K128K128K
Parameters———
Tool callingSupportedSupportedSupported
Structured outputSupportedSupportedSupported
Image inputNot reportedSupportedSupported
ReasoningNot reportedSupportedSupported
Prompt cachingNot reportedSupportedSupported

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