Both are Anthropic models. Claude Sonnet 4.6 is the newer, generally stronger default; reach for Claude Opus 4.6 when a specific cost or latency profile matters more than the latest capabilities.
Claude Opus 4.6 and Claude Sonnet 4.6 are both Anthropic models, so the real question is not which lab to trust but which tier fits your workload and budget. Claude Opus 4.6 is anthropic's February 2026 flagship Opus and the first Opus-class model with a 1M-token context window, built for agentic coding and long-running professional tasks. Claude Sonnet 4.6 is opus-class quality at lower cost; superseded as the default Sonnet by Claude Sonnet 5 (June 2026). Since both come from the same lab, the comparison below focuses on the tier-and-cost trade-offs that actually separate them.
Key differences
Price: Claude Sonnet 4.6 is about 1.7× cheaper on input ($3/$15 per 1M tokens vs $5/$25 per 1M tokens) — modest, but it adds up at steady volume.
Context window: both advertise 1M (~1,500 pages). Tie on paper — test on your own long inputs, since usable recall varies by model.
Coding: a near dead heat on SWE-Bench Verified (80.8% vs 79.6%) — both are top-tier coders.
Specifications
Spec
Claude Opus 4.6
Claude Sonnet 4.6
Provider
Anthropic (US)
Anthropic (US)
Released
February 5, 2026
February 17, 2026
Context window
1M (~1,500 pages)
1M (~1,500 pages)
Price (in/out)
$5/$25 per 1M tokens
$3/$15 per 1M tokens
Open weight?
No — API only
No — API only
Modalities
text, image, code
text, image, code
SWE-Bench Verified
80.8%
79.6%
MRCR v2 @ 1M
76%
Not published
Who wins what
Agentic coding and debugging in large codebases: Claude Opus 4.6 — A core design strength of Claude Opus 4.6.
Long-running, multi-step autonomous agent tasks: Claude Opus 4.6 — A core design strength of Claude Opus 4.6.
Frontier multidisciplinary reasoning (leads Humanity's Last Exam): Claude Opus 4.6 — A core design strength of Claude Opus 4.6.
Best value in the Claude family: Claude Sonnet 4.6 — A core design strength of Claude Sonnet 4.6.
Everyday professional work: Claude Sonnet 4.6 — A core design strength of Claude Sonnet 4.6.
Long-document analysis: Claude Sonnet 4.6 — A core design strength of Claude Sonnet 4.6.
Lowest cost at scale: Claude Sonnet 4.6 — At $3/$15 per 1M tokens, it is the cheaper of the two — the gap dominates the bill on high-volume workloads.
Which should you pick?
A cost-sensitive startup shipping high volume: Claude Sonnet 4.6 — At $3/$15 per 1M tokens it undercuts Claude Opus 4.6, and on millions of tokens that margin decides the monthly bill.
Anyone whose priority is agentic coding and debugging in large codebases: Claude Opus 4.6 — It is specifically built for that.
Anyone whose priority is best value in the claude family: Claude Sonnet 4.6 — That is its strongest area.
Claude Opus 4.6: where it fits
Anthropic's February 2026 flagship Opus and the first Opus-class model with a 1M-token context window, built for agentic coding and long-running professional tasks. Released February 5, 2026 by Anthropic, it is built for agentic coding and debugging in large codebases, long-running, multi-step autonomous agent tasks, frontier multidisciplinary reasoning (leads Humanity's Last Exam), and economically valuable knowledge work in finance and legal (GDPval-AA).
Its trade-offs are real: superseded by newer Claude Opus 4.7 and 4.8 (now a legacy model), and top-tier per-token price, and its 1M-token context shipped as beta. At $5 in / $25 out per million tokens, it sits in the premium price band.
Claude Sonnet 4.6: where it fits
Opus-class quality at lower cost; superseded as the default Sonnet by Claude Sonnet 5 (June 2026). Released February 17, 2026 by Anthropic, it is built for best value in the Claude family, everyday professional work, long-document analysis, and coding at lower cost than Opus.
Its trade-offs: trails Opus on the hardest agentic tasks, and not an open-weight option. At $3 in / $15 out per million tokens, it sits in the mid price band.
The bottom line for this matchup
Because Claude Opus 4.6 and Claude Sonnet 4.6 come from the same lab (Anthropic), they share the same training philosophy and ecosystem — the decision is purely tier vs. cost. Claude Sonnet 4.6 is the more capable, more recent option; the other earns its place only when its price or latency profile fits a specific job better. Most teams should default to Claude Sonnet 4.6 and drop down only with a concrete reason.
Frequently asked questions
Is Claude Opus 4.6 or Claude Sonnet 4.6 better for coding?
On SWE-Bench Verified, Claude Opus 4.6 scores 80.8% and Claude Sonnet 4.6 scores 79.6% — effectively a tie, so pick on price and ecosystem.
Which is cheaper, Claude Opus 4.6 or Claude Sonnet 4.6?
Claude Sonnet 4.6 is cheaper — $5/$25 per 1M tokens vs $3/$15 per 1M tokens, roughly 1.7× apart on input.
Which has the bigger context window?
Both advertise 1M (~1,500 pages). Remember advertised ≠ usable: recall typically degrades before the ceiling.
Should I upgrade from Claude Opus 4.6 to Claude Sonnet 4.6?
Since both are Anthropic models, the newer one (Claude Sonnet 4.6) is usually the better default unless you need a specific cost or latency profile from the other.
Which is newer, Claude Opus 4.6 or Claude Sonnet 4.6?
Claude Sonnet 4.6 — released February 17, 2026, about 12 days after Claude Opus 4.6.
Claude Opus 4.6 vs Claude Sonnet 4.6
Anthropic · US | Anthropic · US · Updated June 2026
Quick verdict
Both are Anthropic models. Claude Sonnet 4.6 is the newer, generally stronger default; reach for Claude Opus 4.6 when a specific cost or latency profile matters more than the latest capabilities.
Claude Opus 4.6 and Claude Sonnet 4.6 are both Anthropic models, so the real question is not which lab to trust but which tier fits your workload and budget. Claude Opus 4.6 is anthropic's February 2026 flagship Opus and the first Opus-class model with a 1M-token context window, built for agentic coding and long-running professional tasks. Claude Sonnet 4.6 is opus-class quality at lower cost; superseded as the default Sonnet by Claude Sonnet 5 (June 2026). Since both come from the same lab, the comparison below focuses on the tier-and-cost trade-offs that actually separate them.
Key differences at a glance
▸Price: Claude Sonnet 4.6 is about 1.7× cheaper on input ($3/$15 per 1M tokens vs $5/$25 per 1M tokens) — modest, but it adds up at steady volume.
▸Context window: both advertise 1M (~1,500 pages). Tie on paper — test on your own long inputs, since usable recall varies by model.
▸Coding: a near dead heat on SWE-Bench Verified (80.8% vs 79.6%) — both are top-tier coders.
Side-by-side specs
Spec
Claude Opus 4.6
Claude Sonnet 4.6
Provider
Anthropic (US)
Anthropic (US)
Released
February 5, 2026
February 17, 2026
Context window
1M (~1,500 pages)
1M (~1,500 pages)
Price (in/out)
$5/$25 per 1M tokens
$3/$15 per 1M tokens
Open weight?
No — API only
No — API only
Modalities
text, image, code
text, image, code
SWE-Bench Verified
80.8%
79.6%
MRCR v2 @ 1M
76%
Not published
Who wins what
Agentic coding and debugging in large codebases
Claude Opus 4.6
A core design strength of Claude Opus 4.6.
Long-running, multi-step autonomous agent tasks
Claude Opus 4.6
A core design strength of Claude Opus 4.6.
Frontier multidisciplinary reasoning (leads Humanity's Last Exam)
Claude Opus 4.6
A core design strength of Claude Opus 4.6.
Best value in the Claude family
Claude Sonnet 4.6
A core design strength of Claude Sonnet 4.6.
Everyday professional work
Claude Sonnet 4.6
A core design strength of Claude Sonnet 4.6.
Long-document analysis
Claude Sonnet 4.6
A core design strength of Claude Sonnet 4.6.
Lowest cost at scale
Claude Sonnet 4.6
At $3/$15 per 1M tokens, it is the cheaper of the two — the gap dominates the bill on high-volume workloads.
Which should you pick?
A cost-sensitive startup shipping high volume
→ Claude Sonnet 4.6
At $3/$15 per 1M tokens it undercuts Claude Opus 4.6, and on millions of tokens that margin decides the monthly bill.
Anyone whose priority is agentic coding and debugging in large codebases
→ Claude Opus 4.6
It is specifically built for that.
Anyone whose priority is best value in the claude family
→ Claude Sonnet 4.6
That is its strongest area.
Claude Opus 4.6: where it fits
Anthropic's February 2026 flagship Opus and the first Opus-class model with a 1M-token context window, built for agentic coding and long-running professional tasks. Released February 5, 2026 by Anthropic, it is built for agentic coding and debugging in large codebases, long-running, multi-step autonomous agent tasks, frontier multidisciplinary reasoning (leads Humanity's Last Exam), and economically valuable knowledge work in finance and legal (GDPval-AA).
Its trade-offs are real: superseded by newer Claude Opus 4.7 and 4.8 (now a legacy model), and top-tier per-token price, and its 1M-token context shipped as beta. At $5 in / $25 out per million tokens, it sits in the premium price band.
Claude Sonnet 4.6: where it fits
Opus-class quality at lower cost; superseded as the default Sonnet by Claude Sonnet 5 (June 2026). Released February 17, 2026 by Anthropic, it is built for best value in the Claude family, everyday professional work, long-document analysis, and coding at lower cost than Opus.
Its trade-offs: trails Opus on the hardest agentic tasks, and not an open-weight option. At $3 in / $15 out per million tokens, it sits in the mid price band.
The bottom line for this matchup
Because Claude Opus 4.6 and Claude Sonnet 4.6 come from the same lab (Anthropic), they share the same training philosophy and ecosystem — the decision is purely tier vs. cost. Claude Sonnet 4.6 is the more capable, more recent option; the other earns its place only when its price or latency profile fits a specific job better. Most teams should default to Claude Sonnet 4.6 and drop down only with a concrete reason.
Want both Claude Opus 4.6 and Claude Sonnet 4.6 without two subscriptions? LumiChats gives you these plus 40+ models under one ₹69/day pass (about $1/day) — draft with one, cross-check with the other.
Is Claude Opus 4.6 or Claude Sonnet 4.6 better for coding?
On SWE-Bench Verified, Claude Opus 4.6 scores 80.8% and Claude Sonnet 4.6 scores 79.6% — effectively a tie, so pick on price and ecosystem.
Which is cheaper, Claude Opus 4.6 or Claude Sonnet 4.6?
Claude Sonnet 4.6 is cheaper — $5/$25 per 1M tokens vs $3/$15 per 1M tokens, roughly 1.7× apart on input.
Which has the bigger context window?
Both advertise 1M (~1,500 pages). Remember advertised ≠ usable: recall typically degrades before the ceiling.
Should I upgrade from Claude Opus 4.6 to Claude Sonnet 4.6?
Since both are Anthropic models, the newer one (Claude Sonnet 4.6) is usually the better default unless you need a specific cost or latency profile from the other.
Which is newer, Claude Opus 4.6 or Claude Sonnet 4.6?
Claude Sonnet 4.6 — released February 17, 2026, about 12 days after Claude Opus 4.6.
Specifications and benchmarks reflect publicly reported figures as of June 2026 and may change as providers release updates. Always verify on your own workload.